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AD7607

Data Sheet

Rev. C | Page 22 of 32

TYPICAL CONNECTION DIAGRAM

Figure 39 shows the typical connection diagram for the AD7607.

There are four AVCC supply pins on the part, and each of the

four pins should be decoupled using a 100 nF capacitor at each

supply pin and a 10 µF capacitor at the supply source. The AD7607

can operate with the internal reference or an externally applied

reference. In this configuration, the AD7607 is configured to

operate with the internal reference. When using a single AD7607

device on the board, the REFIN/REFOUT pin should be decoupled

with a 10 µF capacitor. When using an application with multiple

AD7607 devices, refer to the Internal/External Reference section.

The REFCAPA and REFCAPB pins are shorted together and

decoupled with a 10 µF ceramic capacitor.

The VDRIVE supply is connected to the same supply as the

processor. The VDRIVE voltage controls the voltage value of the

output logic signals. For layout, decoupling, and grounding

hints, see the Layout Guidelines section.

POWER-DOWN MODES

Two power-down modes are available on the AD7607: standby

mode and shutdown mode. The STBY pin controls whether

the AD7607 is in normal mode or in one of the two power-

down modes.

The power-down mode is selected through the state of the RANGE

pin when the STBY pin is low. Table 7 shows the configurations

required to choose the desired power-down mode. When the

AD7607 is placed in standby mode, current consumption is 8 mA

maximum and power-up time is approximately 100 µs because

the capacitor on the REFCAPA and REFCAPB pins must charge

up. In standby mode, the on-chip reference and regulators

remain powered up, and the amplifiers and ADC core are

powered down.

When the AD7607 is placed in shutdown mode, current

consumption is 6 µA maximum and power-up time is

approximately 13 ms (external reference mode). In shutdown

mode, all circuitry is powered down. When the AD7607 is

powered up from shutdown mode, a RESET signal must be

applied to the AD7607 after the required power-up time has

elapsed.

Table 7. Power-Down Mode Selection

Power-Down Mode

STBY

RANGE

Standby

Shutdown

AVCC

AGND

VDRIVE

REFIN/REFOUT

DB0 TO DB15

CONVST A, CONVST B

BUSY

RESET

AD7607

1µF

10µF

100nF

DIGITAL SUPPLY

VOLTAGE +2.3V TO +5V

ANALOG SUPPLY

VOLTAGE 5V1

EIGHT ANALOG

INPUTS V1 TO V8

PARALLEL

INTERFACE

1DECOUPLING SHOWN ON THE AVCC PIN APPLIES TO EACH AVCC PIN (PIN 1, PIN 37, PIN 38, PIN 48).

DECOUPLING CAPACITOR CAN BE SHARED BETWEEN AVCC PIN 37 AND PIN 38.

2DECOUPLING SHOWN ON THE REGCAP PIN APPLIES TO EACH REGCAP PIN (PIN 36, PIN 39).

REGCAP2

10µF

REFCAPA

REFCAPB

OS 2

OS 1

OS 0

OVERSAMPLING

100nF

PAR/SER SEL

STBY

REF SELECT

RANGE

REFGND

V1GND

V2GND

V3GND

V4GND

V5GND

V6GND

V7GND

V8GND

VDRIVE

Figure 39. Typical Connection Diagram

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