The AD628 is a precision difference amplifier that combines excellent dc performance with high common-mode rejection over a wide range of frequencies. When used to scale high voltages, it allows simple conversion of standard control voltages or currents for use with single-supply ADCs. A wideband feedback loop minimizes distortion effects due to capacitor charging of Σ-Δ ADCs.

A reference pin (V_REF) provides a dc offset for converting bipolar to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA input signals to a single-ended output within the input range of single-supply ADCs.

The AD628 has an input common mode and differential mode operating range of ±120 V. The high common mode, input impedance makes the device well suited for high voltage measurements across a shunt resistor. The inverting input of the buffer amplifier is available for making a remote Kelvin connection.

A precision 10 kΩ resistor connected to an external pin is provided for either a low-pass filter or to attenuate large differential input signals. A single capacitor implements a low-pass filter. The AD628 operates from single and dual supplies and is available in an 8-lead SOIC_N or an 8-lead MSOP. It operates over the standard industrial temperature range of −40°C to +85°C.

Applications

High voltage current shunt sensing

Programmable logic controllers

Analog input front end signal conditioning
+5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA

Isolation Sensor signal conditioning

Power supply monitoring

Electrohydraulic controls

Motor controls

Data Sheet, Rev. G, 4/07

Part#	Common Mode Range (V)	Bandwidth G=10 (kHz typ)	CMRR (dB)	Gain Range (min to max)	Voltage Supply (Vmin)	Voltage Supply (Vmax)	Supply Current (max)	VosiTC (µV/deg C)	Gain temp co.	Temperature Range	Package	Price* (1000-4999)
AD22057	-1 to 24	30	80	20	+3	+26	0.5mA	-	-	-40 to +125	DIP, SOIC	$4.62
AD626	0 to 54	100	66	90	±2.4	±6	2mA	0.000006	150ppm/C	-40 to +85	DIP, SOIC	$3.70
AD628	+/- 100	600	77	100	±5	±18	1.6mA	-	-	-40 to +85	SOIC	$1.78
AD629	+/- 270	500	77	1	±2.5	±18	1mA	-	-	-40 to +85	DIP, SOIC	$2.84
AD8202	-12 to 30	50	82	20	+3.5	+12	0.25mA	10	20ppm/C	-40 to +125	Die, SOIC, SOP	$1.51
AD8203	-12 to 30	60	82	14	+3.5	+12	0.25mA	10	20ppm/C	-40 to +125	SOP	$1.37
AD8205	-2 to 65	50	78	50	+4.5	+5	2mA	15	30ppm/C	-40 to +125	Die, SOIC	$1.51
AD8206	-2 to 65	100	76	20	+4.5	+5.5	2mA	15	30ppm/C	-40 to +125	Die, SOIC	$1.37
AD8210	-2 to 65	500	100	20	+4.5	+5.5	1.5mA	10	20ppm/C	-40 to +125	SOIC	$1.81
AD8211	-2 to 65	500	120	20	-	-	2mA	12	20ppm/C	-40 to +125	SOT	$0.81
AD8212	7 to 65	1000	100	1,000	+7	+65	720µA	10	-	-40 to +125	MSOP	$0.93
AD8213	-2 to 65	500	100	20	+4.5	+5.5	2.5mA	12	10ppm/C	-40 to +125	MSOP	$2.01
AD8214	5 to 65	-	80	100	+5	+65	1.2mA	15	-	-40 to +125	MSOP	$0.76
AD8215	-2 to 65	450	100	20	-	-	2.2mA	6	15ppm/C	-40 to +125	SOIC	$1.21
AD8216	-4 to 65	3000	90	3	-	-	2mA	10	10ppm/C	-40 to +125	SOIC	$1.62
AD8228	-	650	100	10,100	-	-	-	-	-	-40 to +85	-	$3.03
AD8270	-Vs to +Vs	10000	98	1.5	-	-	2.5mA	1.5	1ppm/C	-40 to +125	-	$1.89
AD8273	+/- 40	20000	86	1.5	-	-	2.5mA	3	2ppm/C	-40 to +125	-	$1.67
AD8290	-	-	120	50	-	-	4.68mA	-	15ppm/C	-	-	$1.52
AD8553	-	1	100	10,000	+1.8	+5.5	1.3mA	-	-	-40 to +85	MSOP	$1.32
ADM4073	2 to 28	1800	90	40	+3	+28	-	-	-	-40 to +125	SOT	$0.99
AMP03	+/- 20	3000	85	1	±5	±15	2.5mA	-	-	-40 to +85	-	$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.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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