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AD7952

Rev. 0 | Page 11 of 32

Pin No.

Mnemonic

Type1

Description

IN−

Analog Input. Referenced to IN+.

In the 0 V to 5 V input range, IN− is between 0 V and VREF V centered about VREF/2. In the 0 V to

10 V range, IN− is between 0 V and 2 VREF V centered about VREF.

In the ±5 V and ±10 V ranges, IN− is true bipolar up to ±2 VREF V (±5 V range) or ±4 VREF V (±10 V range)

and centered about 0 V.

In all ranges, IN− must be driven 180° out of phase with IN+.

VCC

High Voltage Positive Supply. Normally 7 V to 15 V.

VEE

High Voltage Negative Supply. Normally 0 V to −15 V (0 V in unipolar ranges).

IN+

Analog Input. Referenced to IN−.

In the 0 V to 5 V input range, IN+ is between 0 V and VREF V centered about VREF/2. In the 0 V to

10 V range, IN+ is between 0 V and 2 VREF V centered about VREF.

In the ±5 V and ±10 V ranges, IN+ is true bipolar up to ±2 VREF V (±5 V range) or ±4 VREF V (±10 V range)

and centered about 0 V.

In all ranges, IN+ must be driven 180° out of phase with IN−.

TEMP

Temperature Sensor Analog Output. When the internal reference is enabled (PDREF = PDBUF = low),

this pin outputs a voltage proportional to the temperature of the AD7952. See the Temperature Sensor

section.

REFBUFIN

Reference Buffer Input. When using an external reference with the internal reference buffer

(PDBUF = low, PDREF = high), applying 2.5 V on this pin produces 5 V on the REF pin.

See the Single-to-Differential Driver section.

PDREF

Internal Reference Power-Down Input.

When low, the internal reference is enabled.

When high, the internal reference is powered down, and an external reference must be used.

PDBUF

Internal Reference Buffer Power-Down Input.

When low, the buffer is enabled (must be low when using internal reference).

When high, the buffer is powered down.

1 AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DI/O = bidirectional digital; DO = digital output; P = power.

2 In serial configuration mode (SER/PAR = high, HW/SW = low), this input is programmed with the serial configuration register, and this pin is a don’t care. See the

Hardware Configuration section and Software Configuration section.

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