amplifiers comparators

AD8221

Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the AD8221 family does

The AD8221 is a precision, gain-programmable instrumentation amplifier available in SOIC and MSOP packages. It features a wide power supply range of ±2.3 V to ±18 V, an 825 kHz bandwidth, and a 2 V/µs slew rate. The device maintains 80 dB minimum common-mode rejection ratio up to 10 kHz, ensuring excellent AC performance. It is typically used in weigh scales, industrial process controls, bridge amplifiers, and medical instrumentation. The part supports programmable gain from 1 to 1000 via a single external resistor, making it ideal for precision data acquisition and transducer interfaces where high accuracy and low noise are required across industrial temperature ranges.

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Start building with AD8221 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
Ordering code:
01 — Key specifications

AD8221BR datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 900 µA 1 mA POWER SUPPLY ADI datasheet, p. 4 — AD8221
output current — 18 mA — OUTPUT ADI datasheet, p. 4 — AD8221
input offset voltage drift — 300 nV/°C — ADI datasheet, p. 1
input offset voltage — 25 µV — ADI datasheet, p. 1
gain bandwidth — 825 kHz — G = 1, small signal -3 dB bandwidth ADI datasheet, p. 4 — AD8221
cmrr 130 dB — — cmrr; COMMON-MODE REJECTION RATIO (CMRR) ADI datasheet, p. 5 — Table 2.
operating temperature (abs max) -40 °C — 125 °C Table 3. ADI datasheet, p. 8 — Table 3.
input offset current drift — 500 fA/°C — ADI datasheet, p. 3 — Table 1.
input offset current — 200 pA 600 pA ADI datasheet, p. 3 — Table 1.
input bias current — 500 pA 1.5 nA ADI datasheet, p. 3 — Table 1.
slew rate 1.5 V/µs 2 V/µs — G = 1; Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
psrr — 145 dB — Positive PSRR, RTI, G = 1 to 1000, 0.1 Hz to 1 Hz (typical) ADI datasheet, p. 11
input voltage noise density — — 8 nV/√Hz VIN+, VIN-, VREF = 0 ADI datasheet, p. 3 — Table 1.
response time — 10 µs — Settling time to 0.01%, 10 V step, G = 1 to 100 ADI datasheet, p. 4 — AD8221
settling time — 13 µs — Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
channel count — 1 — ADI datasheet, p. 1
02 — FAQ

AD8221BR frequently asked questions

What is the channel count of the AD8221BR?

The channel count is 1.

What is the common-mode rejection ratio (CMRR) of the AD8221BR?

The common-mode rejection ratio (CMRR) is 130 dB.

What is the gain bandwidth of the AD8221BR at G = 1, small signal -3 dB bandwidth?

The gain bandwidth is 825 kHz.

What is the input bias current of the AD8221BR?

The input bias current is 500 pA.

What is the input offset current of the AD8221BR?

The input offset current is 200 pA.

What is the input offset current drift for the AD8221BR?

The input offset current drift is 500 fA/°C.

What is the input offset voltage of the AD8221BR?

The input offset voltage is 25 µV.

What is the input offset voltage drift of the AD8221BR?

The input offset voltage drift is 300 nV/°C.

What is the input voltage noise density when VIN+, VIN-, and VREF are 0?

The input voltage noise density is 8 nV/√Hz when VIN+, VIN-, and VREF are 0.

What is the maximum operating temperature specified in Table 3?

The maximum operating temperature is 125 °C.

What is the output current when the output is active?

The output current is 18 mA.

What is the typical positive PSRR for the AD8221BR at G = 1 to 1000 in the 0.1 Hz to 1 Hz range?

The typical positive PSRR is 145 dB.

01 — Key specifications

AD8221BRZ datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 900 µA 1 mA POWER SUPPLY ADI datasheet, p. 4 — AD8221
output current — 18 mA — OUTPUT ADI datasheet, p. 4 — AD8221
input offset voltage drift — 300 nV/°C — ADI datasheet, p. 1
input offset voltage — 25 µV — ADI datasheet, p. 1
gain bandwidth — 825 kHz — G = 1, small signal -3 dB bandwidth ADI datasheet, p. 4 — AD8221
cmrr 130 dB — — cmrr; COMMON-MODE REJECTION RATIO (CMRR) ADI datasheet, p. 5 — Table 2.
operating temperature (abs max) -40 °C — 125 °C Table 3. ADI datasheet, p. 8 — Table 3.
input offset current drift — 500 fA/°C — ADI datasheet, p. 3 — Table 1.
input offset current — 200 pA 600 pA ADI datasheet, p. 3 — Table 1.
input bias current — 500 pA 1.5 nA ADI datasheet, p. 3 — Table 1.
slew rate 1.5 V/µs 2 V/µs — G = 1; Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
psrr — 145 dB — Positive PSRR, RTI, G = 1 to 1000, 0.1 Hz to 1 Hz (typical) ADI datasheet, p. 11
input voltage noise density — — 8 nV/√Hz VIN+, VIN-, VREF = 0 ADI datasheet, p. 3 — Table 1.
response time — 10 µs — Settling time to 0.01%, 10 V step, G = 1 to 100 ADI datasheet, p. 4 — AD8221
settling time — 13 µs — Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
channel count — 1 — ADI datasheet, p. 1
02 — FAQ

AD8221BRZ frequently asked questions

What is the channel count of the AD8221BRZ?

The channel count is 1.

What is the common-mode rejection ratio (CMRR) of the AD8221BRZ?

The common-mode rejection ratio (CMRR) is 130 dB.

What is the gain bandwidth of the AD8221BRZ at G = 1, small signal -3 dB bandwidth?

The gain bandwidth is 825 kHz.

What is the input bias current of the AD8221BRZ?

The input bias current is 500 pA.

What is the input offset current?

The input offset current is 200 pA.

What is the input offset current drift for the AD8221BRZ?

The input offset current drift is 500 fA/°C.

What is the input offset voltage of the AD8221BRZ?

The input offset voltage is 25 µV.

What is the input offset voltage drift for the AD8221BRZ?

The input offset voltage drift is 300 nV/°C.

What is the input voltage noise density when VIN+, VIN-, and VREF are 0?

The input voltage noise density is 8 nV/√Hz.

What is the operating temperature specified in Table 3?

The operating temperature is 125 °C.

What is the output current of the AD8221BRZ?

The output current is 18 mA.

What is the typical positive power supply rejection ratio (PSRR) referred to input (RTI) for gains of 1 to 1000 in the 0.1 Hz to 1 Hz frequency range?

The typical positive PSRR is 145 dB.

01 — Key specifications

AD8221AR datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 900 µA 1 mA POWER SUPPLY ADI datasheet, p. 4 — AD8221
output current — 18 mA — OUTPUT ADI datasheet, p. 4 — AD8221
gain bandwidth — 825 kHz — G = 1, small signal -3 dB bandwidth ADI datasheet, p. 4 — AD8221
cmrr 130 dB — — cmrr; COMMON-MODE REJECTION RATIO (CMRR) ADI datasheet, p. 5 — Table 2.
operating temperature (abs max) -40 °C — 125 °C Table 3. ADI datasheet, p. 8 — Table 3.
input offset current drift — 500 fA/°C — ADI datasheet, p. 3 — Table 1.
input offset current — 200 pA 600 pA ADI datasheet, p. 3 — Table 1.
input bias current — 500 pA 1.5 nA ADI datasheet, p. 3 — Table 1.
slew rate 1.5 V/µs 2 V/µs — G = 1; Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
psrr — 145 dB — Positive PSRR, RTI, G = 1 to 1000, 0.1 Hz to 1 Hz (typical) ADI datasheet, p. 11
input voltage noise density — — 8 nV/√Hz VIN+, VIN-, VREF = 0 ADI datasheet, p. 3 — Table 1.
response time — 10 µs — Settling time to 0.01%, 10 V step, G = 1 to 100 ADI datasheet, p. 4 — AD8221
settling time — 13 µs — Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
channel count — 1 — ADI datasheet, p. 1
02 — FAQ

AD8221AR frequently asked questions

What is the channel count of the AD8221AR?

The channel count is 1.

What is the common-mode rejection ratio (CMRR) of the AD8221AR?

The common-mode rejection ratio (CMRR) is 130 dB.

What is the gain bandwidth of the AD8221AR at G = 1, small signal -3 dB bandwidth?

The gain bandwidth is 825 kHz.

What is the input bias current of the AD8221AR?

The input bias current is 500 pA.

What is the input offset current of the AD8221AR?

The input offset current is 200 pA.

What is the input offset current drift for the AD8221AR?

The input offset current drift is 500 fA/°C.

What is the input voltage noise density when VIN+, VIN-, and VREF are 0?

The input voltage noise density is 8 nV/√Hz when VIN+, VIN-, and VREF are 0.

What is the maximum operating temperature specified in Table 3?

The maximum operating temperature is 125 °C.

What is the output current of the AD8221AR?

The output current is 18 mA.

What is the typical positive PSRR for the AD8221AR at G = 1 to 1000 in the 0.1 Hz to 1 Hz range?

The typical positive PSRR is 145 dB.

What is the quiescent current of the AD8221AR under POWER SUPPLY conditions?

The quiescent current is 900 µA.

What is the response time of the AD8221AR when settling to 0.01% with a 10 V step at gains from 1 to 100?

The response time is 10 µs.

01 — Key specifications

AD8221ARM datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 900 µA 1 mA POWER SUPPLY ADI datasheet, p. 4 — AD8221
output current — 18 mA — OUTPUT ADI datasheet, p. 4 — AD8221
gain bandwidth — 825 kHz — G = 1, small signal -3 dB bandwidth ADI datasheet, p. 4 — AD8221
cmrr 130 dB — — cmrr; COMMON-MODE REJECTION RATIO (CMRR) ADI datasheet, p. 5 — Table 2.
operating temperature (abs max) -40 °C — 125 °C Table 3. ADI datasheet, p. 8 — Table 3.
input offset current drift — 500 fA/°C — ADI datasheet, p. 3 — Table 1.
input offset current — 200 pA 600 pA ADI datasheet, p. 3 — Table 1.
input bias current — 500 pA 1.5 nA ADI datasheet, p. 3 — Table 1.
slew rate 1.5 V/µs 2 V/µs — G = 1; Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
psrr — 145 dB — Positive PSRR, RTI, G = 1 to 1000, 0.1 Hz to 1 Hz (typical) ADI datasheet, p. 11
input voltage noise density — — 8 nV/√Hz VIN+, VIN-, VREF = 0 ADI datasheet, p. 3 — Table 1.
response time — 10 µs — Settling time to 0.01%, 10 V step, G = 1 to 100 ADI datasheet, p. 4 — AD8221
settling time — 13 µs — Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
channel count — 1 — ADI datasheet, p. 1
02 — FAQ

AD8221ARM frequently asked questions

What is the channel count of the AD8221ARM?

The channel count is 1.

What is the common-mode rejection ratio (CMRR) of the AD8221ARM?

The common-mode rejection ratio (CMRR) is 130 dB.

What is the gain bandwidth of the AD8221ARM at G = 1, small signal -3 dB bandwidth?

The gain bandwidth is 825 kHz.

What is the input bias current of the AD8221ARM?

The input bias current is 500 pA.

What is the input offset current of the AD8221ARM?

The input offset current is 200 pA.

What is the input offset current drift for the AD8221ARM?

The input offset current drift is 500 fA/°C.

What is the input voltage noise density when VIN+, VIN-, and VREF are 0?

The input voltage noise density is 8 nV/√Hz.

What is the maximum operating temperature specified in Table 3?

The operating temperature is 125 °C.

What is the output current of the AD8221ARM?

The output current is 18 mA.

What is the typical positive PSRR for the AD8221ARM at RTI with a gain of 1 to 1000 in the 0.1 Hz to 1 Hz range?

The typical positive PSRR is 145 dB.

What is the quiescent current of the AD8221ARM when the power supply is active?

The quiescent current is 900 µA.

What is the response time of the AD8221ARM?

The response time is 10 µs, measured as the settling time to 0.01% with a 10 V step at gains from 1 to 100.

01 — Key specifications

AD8221ARMZ datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 900 µA 1 mA POWER SUPPLY ADI datasheet, p. 4 — AD8221
output current — 18 mA — OUTPUT ADI datasheet, p. 4 — AD8221
gain bandwidth — 825 kHz — G = 1, small signal -3 dB bandwidth ADI datasheet, p. 4 — AD8221
cmrr 130 dB — — cmrr; COMMON-MODE REJECTION RATIO (CMRR) ADI datasheet, p. 5 — Table 2.
operating temperature (abs max) -40 °C — 125 °C Table 3. ADI datasheet, p. 8 — Table 3.
input offset current drift — 500 fA/°C — ADI datasheet, p. 3 — Table 1.
input offset current — 200 pA 600 pA ADI datasheet, p. 3 — Table 1.
input bias current — 500 pA 1.5 nA ADI datasheet, p. 3 — Table 1.
slew rate 1.5 V/µs 2 V/µs — G = 1; Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
psrr — 145 dB — Positive PSRR, RTI, G = 1 to 1000, 0.1 Hz to 1 Hz (typical) ADI datasheet, p. 11
input voltage noise density — — 8 nV/√Hz VIN+, VIN-, VREF = 0 ADI datasheet, p. 3 — Table 1.
response time — 10 µs — Settling time to 0.01%, 10 V step, G = 1 to 100 ADI datasheet, p. 4 — AD8221
settling time — 13 µs — Small Signal -3 dB Bandwidth ADI datasheet, p. 4 — AD8221
channel count — 1 — ADI datasheet, p. 1
02 — FAQ

AD8221ARMZ frequently asked questions

What is the channel count of the AD8221ARMZ?

The channel count is 1.

What is the common-mode rejection ratio (CMRR) of the AD8221ARMZ?

The common-mode rejection ratio (CMRR) is 130 dB.

What is the gain bandwidth of the AD8221ARMZ at G = 1, small signal -3 dB bandwidth?

The gain bandwidth is 825 kHz.

What is the input bias current?

The input bias current is 500 pA.

What is the input offset current?

The input offset current is 200 pA.

What is the input offset current drift for the AD8221ARMZ?

The input offset current drift is 500 fA/°C.

What is the input voltage noise density when VIN+, VIN-, and VREF are 0?

The input voltage noise density is 8 nV/√Hz.

What is the maximum operating temperature specified in Table 3?

The operating temperature is 125 °C as specified in Table 3.

What is the output current when the output is active?

The output current is 18 mA.

What is the typical positive power supply rejection ratio (PSRR) referred to input (RTI) for gains of 1 to 1000 in the 0.1 Hz to 1 Hz frequency range?

The typical positive PSRR (RTI, G = 1 to 1000, 0.1 Hz to 1 Hz) is 145 dB.

What is the quiescent current of the AD8221ARMZ when the power supply is active?

The quiescent current is 900 µA.

What is the response time of the AD8221ARMZ when settling to 0.01% with a 10 V step at gains from 1 to 100?

The response time is 10 µs.

03 — Alternatives

Closest matches to AD8221

INA293A1 6.2× higher input voltage noise density, 6.0× lower input offset voltage drift, 5.0× lower response time
INA180 5.0× higher input voltage noise density, 4.6× lower quiescent current, 4.0× higher input offset voltage
AD8232 10.0× lower input bias current, 8.3× higher output current, 8.2× lower gain bandwidth
AD8232ACPZ-R7 10.0× lower input bias current, 8.3× higher output current, 8.2× lower gain bandwidth
AD620 1.9× lower operating temperature, 1.5× higher input offset current, similar input bias current
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