REV. E

AD9432

–5–

PIN CONFIGURATION

52 51 50 49 48

43 42 41 40

47 46 45 44

14 15 16 17 18 19 20 21 22 23 24 25 26

1

2

3

4

5

6

7

8

9

10

11

13

12

PIN 1

IDENTIFIER

TOP VIEW

(Not to Scale)

39

38

37

36

35

34

33

32

31

30

29

28

27

GND

GND

AD9432

GND

GND

GND

GND

DGND

D0 (LSB)

D1

D2

D3

GND

GND

ENCODE

ENCODE

GND

GND

DGND

DEFINITION OF SPECIFICATIONS

Analog Bandwidth (Small Signal)

The analog input frequency at which the spectral power of the

fundamental frequency (as determined by the FFT analysis) is

reduced by 3 dB.

Aperture Delay

The delay between a differential crossing of ENCODE and

ENCODE and the instant at which the analog input is sampled.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Differential Nonlinearity

The deviation of any code from an ideal 1 LSB step.

Encode Pulsewidth/Duty Cycle

Pulsewidth high is the minimum amount of time that the ENCODE

pulse should be left in Logic “1” state to achieve rated performance;

pulsewidth low is the minimum time ENCODE pulse should be left

in low state. At a given clock rate, these specs define an acceptable

Encode duty cycle.

Integral Nonlinearity

The deviation of the transfer function from a reference line

measured in fractions of 1 LSB using a “best straight line”

determined by a least square curve fit.

Minimum Conversion Rate

The encode rate at which the SNR of the lowest analog signal

frequency drops by no more than 3 dB below the guaranteed limit.

Maximum Conversion Rate

The encode rate at which parametric testing is performed.

Output Propagation Delay

The delay between a differential crossing of ENCODE and

ENCODE and the time when all output data bits are within

valid logic levels.

Power Supply Rejection Ratio

The ratio of a change in input offset voltage to a change in

power supply voltage.

Signal-to-Noise Plus Distortion (SINAD)

The ratio of the rms signal amplitude (set at 1 dB below full

scale) to the rms value of the sum of all other spectral compo-

nents, including harmonics but excluding dc.

Signal-to-Noise Ratio (SNR)

The ratio of the rms signal amplitude (set at 1 dB below full

scale) to the rms value of the sum of all other spectral compo-

nents, excluding the first five harmonics and dc.

PIN FUNCTION DESCRIPTIONS

Pin Number (AD9432BST)

Mnemonic

Function

1, 3, 4, 9, 11, 33, 34, 35, 38, 39, 40, 43, 48, 51

GND

Analog Ground

2, 5, 6, 10, 36, 37, 42, 44, 47, 52

Analog Supply (5 V)

7

ENCODE

Encode Clock for ADC–Complementary

8

ENCODE

Encode Clock for ADC–True (ADC samples on rising edge of ENCODE)

14

OR

Out of Range Output

15–20, 25–30

D11–D6, D5–D0 Digital Output

12, 21, 24, 31

DGND

Digital Output Ground

13, 22, 23, 32

Digital Output Power Supply (2.7 V to 3.6 V)

41

DNC

Do Not Connect

45

VREFIN

Reference Input for ADC (2.5 V Typical); Bypass with 0.1

µF to Ground.

46

VREFOUT

Internal Reference Output (2.5 V Typical)

49

AIN

Analog Input–True

50

AIN

Analog Input–Complementary