The AD8556 is a zero-drift, sensor signal amplifier with digitally programmable gain and output offset. Designed to easily and accurately convert variable pressure sensor and strain bridge outputs to a well-defined output voltage range, the AD8556 accurately amplifies many other differential or single-ended sensor outputs. The AD8556 uses the ADI patented low noise auto-zero and DigiTrim® technologies to create an incredibly accurate and flexible signal processing solution in a very compact footprint.

Gain is digitally programmable in a wide range from 70 to 1,280 through a serial data interface. Gain adjustment can be fully simulated in-circuit and then permanently programmed with reliable polyfuse technology. Output offset voltage is also digitally programmable and is ratiometric to the supply voltage. AD8556 also features internal EMI filters on the VNEG, VPOS, FILT and VCLAMP pins.

In addition to extremely low input offset voltage, low input offset voltage drift, and very high dc and ac CMRR, the AD8556 also includes a pull-up current source at the input pins and a pull-down current source at the VCLAMP pin. This allows open wire and shorted wire fault detection. A low-pass filter function is implemented via a single low cost external capacitor. Output clamping set via an external reference voltage allows the AD8556 to drive lower voltage ADCs safely and accurately.

When used in conjunction with an ADC referenced to the same supply, the system accuracy becomes immune to normal supply voltage variations. Output offset voltage can be adjusted with a resolution of better than 0.4% of the difference between VDD and VSS. A lockout trim after gain and offset adjustment further ensures field reliability.

The AD8556 is fully specified from −40°C to +140°C. Operating from single-supply voltages of 2.7 V to 5.5 V, the AD8556 is offered in the 8-lead SOIC_N, and 4 mm × 4 mm 16-lead LFCSP_VQ.

Applications

Automotive Sensors

Pressure and Position Sensors

Precision Current Sensing

Strain Gages

Part#	Description	Single/Dual Supply	Vcc-Vee	Gain Setting Method	Bandwidth G=10 (kHz typ)	Gain min.	Gain max.	Min CMRR @ 60 Hz Min Gain	Min CMRR @ 60Hz Max Gain	Vnoise RTI 1-10 Hz µVp-p	Price* (1000-4999)
AD522	Diff Amp	Dual	10V to 36V	Resistor	3	1	1,000	75dB	100dB	4	-
AD524	Precision IA	Dual	12V to 36V	Pin	400	1	1,000	70dB	110dB	0.3	$9.52
AD526	Software Programmable	Dual	9V to 33V	Software	350	1	16	-	-	3	$6.39
AD620	General Purpose IA	Dual	4.6V to 36V	Resistor	800	1	10,000	73dB	110dB	0.28	$3.18
AD621	Precision IA	Dual	4.6V to 18V	Pin	800	10	100	93dB	110dB	0.28	$4.09
AD622	Low Cost IA	Dual	5.2V to 36V	Resistor	800	1	1,000	66dB	103dB	0.3	$2.51
AD623	S.S R-R IA	Single/Dual	2.7V to 12V	Resistor	100	1	1,000	70dB	105dB	2	$1.40
AD624	Precision IA	Dual	12V to 36V	Pin	400	1	1,000	70dB	110dB	0.3	$11.93
AD625	Programmable Gain IA	Dual	12V to 36V	Resistor	400	1	10,000	70dB	110dB	0.3	$8.78
AD626	Diff Amp	Single/Dual	2.4V to 12V	Pin	100	10	100	55dB	55dB	2	$3.70
AD627	Micropower IA	Single/Dual	2.2V to 36V	Resistor	30	5	1,000	77dB	77dB	1.2	$2.56
AD628	High CMV DA	Single/Dual	4.5V to 36V	Pin, Resistor	600	0.1	100	75dB	75dB	15	$1.78
AD629	High CMV DA	Dual	5V to 36V	fixed	500	-	-	77dB	77dB	15	$2.84
AD8129	Low Cost Diff Amp	Single/Dual	4.5V to 25V	Resistor	200000	10	-	94dB	-	-	$1.57
AD8202	High CMV DA	Single	3.5V to 12V	fixed	50	-	-	82dB	82dB	10	$1.51
AD8203	High CMV DA	Single	4.5V to 5.5V	fixed	60	-	-	82dB	82dB	10	$1.37
AD8205	S.S Diff Amp	Single	4.5V to 5.5V	fixed	50	-	-	78dB	78dB	20	$1.51
AD8206	S.S Diff Amp	Single	4.5V to 5.5V	fixed	100	-	-	76dB	76dB	20	$1.37
AD8210	Bi-Directional Shunt Mon	Single	4.5V to 5.5V	fixed	500	20	20	100dB	100dB	7	$1.81
AD8211	High CMV Shunt Mon	Single	4.5V to 5.5V	fixed	500	20	20	100dB	100dB	7	$0.81
AD8212	High CMV Shunt Mon	Single	7V to 65V	Resistor	1000	1	1,000	100dB	100dB	1.1	$0.93
AD8213	Dual High CMV Shunt Mon	Single	4.5V to 5.5V	fixed	500	20	20	100dB	100dB	7	$2.01
AD8214	High CMV Threshold Detec	Single	5V to 65V	Resistor	-	1	100	80dB	80dB	2.2	$0.76
AD8215	High CMV Shunt Mon	Single	4.5V to 5.5V	fixed	450	20	20	100dB	100dB	7	$1.21
AD8216	High BW 65 V Diff Amp	Single	4.5V to 5.5V	fixed	3000	3	3	80dB	80dB	20	$1.62
AD8220	R-R JFET IA	Single/Dual	4.6V to 36V	Resistor	800	1	1,000	78dB	94dB	0.8	$2.32
AD8221	High Performance IA	Dual	4.6V to 36V	Resistor	562	1	1,000	80dB	130dB	0.25	$2.01
AD8222	Dual High Performance IA	Dual	- to -	Resistor	750	1	10,000	80dB	130dB	0.25	$3.63
AD8223	S.S R-R IA	Single/Dual	3V to 25V	Pin	200	5	1,000	70dB	105dB	2	-
AD8224	Dual JFET R-R IA	Single/Dual	4.6V to 36V	Resistor	800	1	1,000	78dB	94dB	0.8	$4.17
AD8225	Fixed G=5 IA	Dual	3.4V to 36V	fixed	900	-	-	86dB	86dB	1.5	$3.29
AD8228	Precision IA	Dual	4.6V to 36V	Pin	650	10	100	100dB	120dB	0.5	$3.03
AD8230	Zero Drift IA	Single/Dual	8V to 16V	Resistor	2	2	1,000	-	110dB	3	$2.99
AD8231	Zero Drift Software Prog	Single	3V to 6V	Pin, Software	700	1	128	80dB	110dB	0.7	$1.71
AD8250	Software Programmable	Dual	10V to 34V	Pin, Software	3000	1	10	80dB	98dB	1	$5.01
AD8251	Software Programmable	Dual	10V to 34V	Pin, Software	2500	1	8	80dB	98dB	1.2	$5.01
AD8253	Software Programmable	Dual	10V to 34V	Pin, Software	10000	1	1,000	80dB	120dB	1	$4.95
AD8270	Dual Diff Amp	Dual	5V to 36V	Pin	10000	0.5	2	70dB	80dB	1	$1.89
AD8273	Dual Audio Diff Amp	Dual	5V to 36V	Pin	20000	0.5	2	77dB	-	2	$1.67
AD8290	Sensor Amp	-	2.6V to 5.5V	fixed	-	50	50	-	-	0.75	$1.52
AD8553	Zero Drift IA	Single	1.8V to 5.5V	Resistor	1	0.1	10,000	80dB	120dB	0.7	$1.32
AD8555	Sensor Amp	Single	5.5V to 2.7V	Software	n/a	70	1,280	80dB	96dB	0.5	$3.12
AD8556	Sen/Filter Amp	Single	2.7V to 5.5V	Software	n/a	70	1,280	80dB	94dB	0.5	$2.88
AD8557	Sensor Amp	Single	2.7V to 5.5V	Software	-	28	1,300	75dB	86dB	-	$2.13
AMP03	Precision Diff Amp	Dual	12V to 36V	fixed	3000	-	-	85dB	85dB	2	$2.81

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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