AD7628 datasheet(2/8 Pages) AD

2 / 8 page

TA = –40 CTA = –55 C

Parameter

TA = +25 C

to +85 C

to +125 C

Units

Test Conditions/Comments

STATIC PERFORMANCE

Resolution

Bits

Relative Accuracy

± 1/2

LSB max

This is an Endpoint Linearity Specification

Differential Nonlinearity

± 1

± l

LSB max

All Grades Guaranteed Monotonic Over

Full Operating Temperature Range

Gain Error

± 2

± 3

LSB max

Measured Using Internal RFB A and RFB B.

Both DAC Latches Loaded with 11111111.

Gain Error is Adjustable Using Circuits

of Figures 4 and 5.

Gain Temperature Coefficient

∆Gain/∆Temperature

± 0.0035

°C max

Output Leakage Current

OUT A (Pin 2)

± 50

± 200

nA max

DAC Latches Loaded with 00000000

OUT B (Pin 20)

± 50

± 200

nA max

Input Resistance (VREFA, VREFB)

Ω min

Input Resistance TC = –300 ppm/

°C, Typical

Ω max

Input Resistance is 11 k

Ω

VREFA/VREFB Input Resistance

Match

± 1

% max

DIGITAL INPUTS

Input High Voltage (VIH)

2.4

V min

Input Low Voltage (VIL)

0.8

V max

Input Current (IIN)

± 1

± 10

µA max

VIN = 0 or VDD

Input Capacitance

DB0–DB7

pF max

WR, CS, DACA/DACB

pF max

SWITCHING CHARACTERISTICS

See Timing Diagram

Chip Select to Write Set Up Time (tCS)

160

210

ns min

Chip Select to Write Hold Time (tCH)

ns min

DAC Select to Write Set Up Time (tAS)

160

210

ns min

DAC Select to Write Hold Time (tAH)

ns min

Data Valid to Write Set Up Time (tDS)

160

210

ns min

Data Valid to Write Hold Time (tDH)

ns min

Write Pulse Width (tWR)

150

170

210

ns min

POWER SUPPLY

See Figure 3

IDD, K Grade

All Digital Inputs VIL or VIH

B, T Grades

2.5

All Digital Inputs VIL or VIH

All Grades

100

500

µA

All Digital Inputs 0 V or VDD

Specifications subject to change without notice.

AC PERFORMANCE CHARACTERISTICS

TA = –40 CTA = –55 C

Parameter

TA = +25 C

to +85 C

to +125

πC1

Units

Test Conditions/Comments

DC SUPPLY REJECTION

(

∆GAIN/∆V

DD)

0.01

0.02

% per % max

∆V

DD = ± 5%

CURRENT SETTLING TIME

350

400

ns max

To 1/2 LSB OutA/OutB Load = 100

Ω.

WR = CS = 0 V.

DB0–DB7 = 0 V to VDD or VDD to 0 V

DIGITAL-TO-ANALOG GLITCH

IMPULSE

330

nV sec typ

For Code Transition 00000000 to 11111111

OUTPUT CAPACITANCE

COUTA

pF max

DAC Latches Loaded with 00000000

COUTB

pF max

COUTA

pF max

DAC Latches Loaded with 11111111

COUTB

pF max

AC FEEDTHROUGH

VREFA to OUT A

–70

–65

dB max

VREFA, VREFB = 20 V p-p Sine Wave

VREFB to OUT B

–70

–65

dB max

@ 10 kHz

CHANNEL-TO-CHANNEL ISOLATION

Both DAC Latches Loaded with 11111111.

VREFA to OUT B

–80

dB typ

VREFA = 20 V p-p Sine Wave @ 10 kHz

VREFB = 0 V See Figure 6.

VREFB to OUTA

–80

dB typ

VREFB = 20 V p-p Sine Wave @ 10 kHz

VREFA = 0 V See Figure 6.

DIGITAL CROSSTALK

nV sec typ

Measured for Code Transition 00000000

to 11111111

HARMONIC DISTORTION

–85

dB typ

VIN = 6 V rms @ 1 kHz

NOTES

1Temperature Ranges are K Version; –40

°C to +85°C; B Version; –40°C to +85°C; T Version; –55°C to +125°C.

2Specification applies to both DACs in AD7628.

3Guaranteed by design but not production tested.

4Logic inputs are MOS Gates. Typical input current (+25

°C) is less than 1 nA.

Specifications subject to change without notice.

REV. A

–2–

AD7628–SPECIFICATIONS

(VDD = +10.8 V to +15.75 V, VREF A = VREF B = +10 V; OUT A = OUT B = 0 V unless

otherwise noted)

These characteristics are included for Design Guidance only and are not

subject to test. VDD = +10.8 V to +15.75 V. (Measured Using Recommended PC Board Layout (Figure 7) and AD644 as Output Amplifiers)

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