EVAL-AD5405EB View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-AD5405EB

Dual 12-Bit, High Bandwidth, Multiplying DAC with 4-Quadrant Resistors and Parallel Interface

Analog Devices 

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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

AD5405

R1A 1

R2A 2

R2_3A 3

R3A 4

VREFA 5

DGND 6

LDAC 7

DAC A/B 8

NC 9

DB11 10

PIN 1

INDICATOR

AD5405

TOP VIEW

(Not to Scale)

30 R1B

29 R2B

28 R2_3B

27 R3B

26 VREFB

25 VDD

24 CLR

23 R/W

22 CS

21 DB0

NOTES

1. NC = NO CONNECT.

2. EXPOSED PAD MUST BE CONNECTED TO GROUND.

Figure 4. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1 to 4

R1A, R2B,

R2_3B, R3A

DAC A 4-Quadrant Resistors. Allow a number of configuration modes, including bipolar operation with

minimum of external components.

5, 26

6

VREFA, VREFB

DGND

DAC Reference Voltage Input Terminals.

Digital Ground Pin.

7

LDAC

Load DAC Input. Allows asynchronous or synchronous updates to the DAC output. The DAC is

asynchronously updated when this signal goes low. Alternatively, if this line is held permanently low, an

automatic or synchronous update mode is selected whereby the DAC is updated on the rising edge of CS.

8

DAC A/B

Selects DAC A or B. Low selects DAC A, and high selects DAC B.

9, 34 to 37 NC

Not internally connected.

10 to 21 DB11 to DB0 Parallel Data Bits 11 through 0.

22

CS

Chip Select Input. Active low. Used in conjunction with R/W to load parallel data to the input latch or to

read data from the DAC register. Edge sensitive; when pulled high, the DAC data is latched.

23

R/W

Read/Write. When low, used in conjunction with CS to load parallel data. When high, used in conjunction

with CS to read back contents of DAC register.

24

CLR

Active Low Control Input. Clears DAC output and input and DAC registers.

25

27 to 30

VDD

R3B, R2_3B,

R2B, R1B

Positive Power Supply Input. These parts can be operated from a supply of 2.5 V to 5.5 V.

DAC B 4-Quadrant Resistors. Allow a number of configuration modes, including bipolar operation with a

minimum of external components.

31, 40

32

RFBB, RFBA

IOUT2B

External Amplifier Output.

DAC A Analog Ground. This pin typically should be tied to the analog ground of the system, but can be

biased to achieve single-supply operation.

33

IOUT1B

DAC B Current Outputs.

38

IOUT1A

DAC A Current Outputs.

39

IOUT2A

DAC A Analog Ground. This pin typically should be tied to the analog ground of the system, but can be

biased to achieve single-supply operation.

EPAD

Exposed pad must be connected to ground.

Rev. B | Page 7 of 24

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