Features: High common-mode input voltage range
±120 V at VS=± 15 V
Gain range 0.1 to 100
Operating temperature range: ±40 to ±85
Supply voltage range
Dual supply: ±2.25 V to ±18
Single supply: 4.5 V to 36 V
Excellent ac and dc performance
Offset temperature stability RTI: 10 V/ maX
Offset: 1.5 V mV max
CMRR RTI: 75 dB min, dc to 500 Hz, G = +1
ApplicationHigh 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 control
Motor control Pinout
SpecificationsParameter Rating
Supply Voltage ±18 V
Internal Power DissipationSee Figure 3
Input Voltage (Common Mode)±120V1
Differential Input Voltage ±120V1
Output Short-Circuit DurationIndefinite
Storage Temperature -65 to +125
Operating Temperature Range -40 to +85
Lead Temperature Range (10 sec Soldering) 300
| Single/Dual Supply |
Single/Dual |
| Voltage Supply (Vmax) |
±18V |
| Gain Setting Method |
Pin,Resistor |
| Gain Range (min to max) |
100 |
| Bandwidth G=10 (kHz typ) |
600kHz |
| CMRR (dB) |
77dB |
| Vnoise RTI 1-10 Hz Vp-p |
15V p-p |
| Temperature Range |
-40 to +85 |
| Gain Error (%) max |
+0.01% |
| Supply Current |
1.6mA |
| Package |
SOIC |
| Vosi (V) |
1500V |
DescriptionThe 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 - ADCs.)
A reference pin (V
REF 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-ende output within the input range of single-supply ADCs.
The AD628 has an input common-mode and differentialmode 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 buffer amplifiers
inverting input is available for making a remote Kelvin connection.
A precision 10 k 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 or MSOP package. It operates over the standard industrial temperature range of -40 to +85
AD628 Data Sheet
