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AD7609

Data Sheet

Rev. A | Page 24 of 36

TYPICAL CONNECTION DIAGRAM

Figure 41 shows the typical connection diagram for the

AD7609. There are four AVCC supply pins on the part that

can be tied together and decoupled using a 100 nF capacitor at

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

AD7609 can operate with the internal reference or an externally

applied reference. In this configuration, the AD7609 is config-

ured to operate with the internal reference. When using a single

AD7609 device on the board, the REFIN/REFOUT pin should

be decoupled with a 10 µF capacitor. In an application with

multiple AD7609 devices, see 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 pro-

cessor. The voltage on VDRIVE controls the voltage value of the

output logic signals. For layout, decoupling, and grounding

hints, see the Layout Guidelines section.

After supplies are applied to the AD7609, a reset should be

applied to the AD7609 to ensure that it is configured for the

correct mode of operation.

POWER-DOWN MODES

There are two power-down modes available on the AD7609.

The STBY pin controls whether the AD7609 is in normal mode

or one of the two power-down modes. The two power-down

modes available are standby mode and shutdown mode. The

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

pin when the STBY pin is low. Table 8 shows the configurations

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

AD7609 is placed in standby mode, the current consumption is

8 mA maximum and power-up time is approximately 100 µs

because the capacitor on the REFCAPA/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 AD7609 is placed in shutdown

mode, the current consumption is 11 µA maximum and power

up time is about 13 ms. In shutdown mode, all circuitry

is powered down. When the AD7609 is powered up from

shutdown mode, a reset signal must be applied to the AD7609

after the required power-up time has elapsed.

Table 8. Power-Down Mode Selection

Power-Down Mode

STBY

RANGE

Standby

Shutdown

AVCC

AGND

VDRIVE

REFIN/REFOUT

DB0 TO DB15

CONVST A, B

BUSY

RESET

AD7609

1µF

10µF

100nF

DIGITAL SUPPLY

VOLTAGE +2.3V TO +5V

ANALOG SUPPLY

VOLTAGE 5V1

EIGHT DIFFERENTIAL

ANALOG INPUT PAIRS

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

V1+

PAR/SER SEL

STBY

REF SELECT

RANGE

V2+

V3+

V4+

V5+

V6+

V7+

V8+

REFGND

V1–

V2–

V3–

V4–

V5–

V6–

V7–

V8–

VDRIVE

Figure 41. Typical Connection Diagram

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