AD5765(RevPrA) データシートの表示（PDF） - Analog Devices

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AD5765
(Rev.:RevPrA)

Complete Quad, 16-Bit, High Accuracy, Serial Input, ±5V DACs

Analog Devices 

Preliminary Technical Data

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

AD5765

32 31 30 29 28 27 26 25

SYNC 1

SCLK 2

SDIN 3

SDO 4

CLR 5

LDAC 6

D0 7

D1 8

PIN 1

AD5765

TOP VIEW

(Not to Scale)

24 AGNDA

23 VOUTA

22 VOUTB

21 AGNDB

20 AGNDC

19 VOUTC

18 VOUTD

17 AGNDD

9 10 11 12 13 14 15 16

NC = NO CONNECT

Figure 6. Pin Configuration

Table 6. Pin Function Descriptions

Pin No. Mnemonic

Description

1

SYNC

Active Low Input. This is the frame synchronization signal for the serial interface. While SYNC is low,

data is transferred in on the falling edge of SCLK.

2

SCLK

Serial Clock Input. Data is clocked into the shift register on the falling edge of SCLK. This operates at

clock speeds up to 30 MHz.

3

SDIN

Serial Data Input. Data must be valid on the falling edge of SCLK.

4

SDO

Serial Data Output. Used to clock data from the serial register in daisy-chain or readback mode.

51

CLR1

Negative Edge Triggered Input. Asserting this pin sets the DAC registers to 0x0000.

6

LDAC

Load DAC. Logic input. This is used to update the DAC registers and consequently the analog outputs.

When tied permanently low, the addressed DAC register is updated on the rising edge of SYNC. If

LDAC is held high during the write cycle, the DAC input register is updated but the output update is

held off until the falling edge of LDAC. In this mode, all analog outputs can be updated

simultaneously on the falling edge of LDAC. The LDAC pin must not be left unconnected.

7, 8

D0, D1

9

RSTOUT

D0 and D1 form a digital I/O port. The user can set up these pins as inputs or outputs that are

configurable and readable over the serial interface. When configured as inputs, these pins have weak

internal pull-ups to DVCC. When programmed as outputs, D0 and D1 are referenced by DVCC and DGND.

Reset Logic Output. This is the output from the on-chip voltage monitor used in the reset circuit. If

desired, it can be used to control other system components.

10

RSTIN

Reset Logic Input. This input allows external access to the internal reset logic. Applying a Logic 0 to

this input clamps the DAC outputs to 0 V. In normal operation, RSTIN should be tied to Logic 1.

Register values remain unchanged.

11

DGND

Digital Ground Pin.

12

DVCC

Digital Supply Pin. Voltage ranges from 2.7 V to 5.25 V.

13, 31

14

AVDD

PGND

Positive Analog Supply Pins. Voltage ranges from 4.75 V to 5.25 V.

Ground Reference Point for Analog Circuitry.

15, 30

AVSS

16

ISCC

Negative Analog Supply Pins. Voltage ranges from –4.75 V to –5.25 V.

This pin is used in association with an optional external resistor to AGND to program the short-circuit

current of the output amplifiers. Refer to the AD5765 Features section on page 25 for further details.

17

AGNDD

Ground Reference Pin for DAC D Output Amplifier.

18

VOUTD

Analog Output Voltage of DAC D. Buffered output with a nominal full-scale output range of ±4.096 V. The

output amplifier is capable of directly driving a 5 kΩ, 200 pF load.

19

VOUTC

Analog Output Voltage of DAC C. Buffered output with a nominal full-scale output range of ±4.096 V. The

output amplifier is capable of directly driving a 5 kΩ, 200 pF load.

Rev. PrA | Page 11 of 31

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