AD7943 datasheet(4/16 Pages) AD

4 / 16 page

AD7943/AD7945/AD7948

REV. B

–4–

AC PERFORMANCE CHARACTERISTICS

NORMAL MODE

Parameter

B Grades

T Grade

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE

Output Voltage Settling Time

600

700

ns typ

To 0.01% of Full-Scale Range. VREF =

+10 V; DAC Latch Alternately Loaded with

All 0s and All 1s

Digital to Analog Glitch Impulse

nV-s typ

Measured with VREF = 0 V. DAC Latch

Alternately Loaded with All 0s and All 1s

Multiplying Feedthrough Error

–75

dB max

DAC Latch Loaded with All 0s

Output Capacitance

pF max

All 1s Loaded to DAC

pF max

All 0s Loaded to DAC

Digital Feedthrough (AD7943)

nV-s typ

Feedthrough to the DAC Output with

LD1,

LD2 High and Alternate Loading of All 0s

and All 1s into the Input Shift Register

Digital Feedthrough (AD7945, AD7948) 5

nV-s typ

Feedthrough to the DAC Output with

High and Alternate Loading of All 0s and

All 1s to the DAC Bus

Total Harmonic Distortion

–83

dB typ

Output Noise Spectral Density

@ 1 kHz

nV/

√Hz typ All 1s Loaded to DAC. V

REF = 0 V. Output

Op Amp Is OP07

Specifications subject to change without notice.

(AD7943: VDD = +4.5 V to +5.5 V; VIOUT1 = VIOUT2 = AGND = 0 V. AD7945, AD7948: VDD = +4.5 V to +5.5 V; VIOUT1 =AGND =

0 V. VREF = 6 V rms, 1 kHz sine wave; TA = TMIN to TMAX; DAC output op amp is AD843; unless otherwise noted.) These characteristics are in-

cluded for Design Guidance and are not subject to test.

AC PERFORMANCE CHARACTERISTICS

BIASED MODE (AD7943: VDD = +3 V to +5.5 V; VIOUT1 = VIOUT2 = AGND = 1.23 V. AD7945, AD7948: VDD = +3 V to +5.5 V; VIOUT1 = AGND =

1.23 V. VREF = 1 kHz, 2.45 V p-p, sine wave biased at 1.23 V; DAC output op amp is AD820; TA = TMIN to TMAX; unless otherwise noted.) These

characteristics are included for Design Guidance and are not subject to test.

Parameter

A Grades

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE

Output Voltage Settling Time

µs typ

To 0.01% of Full-Scale Range. VREF = 0 V

DAC Latch Alternately Loaded with All 0s and All 1s

Digital to Analog Glitch Impulse

nV-s typ

VREF = 1.23 V. DAC Register Alternately Loaded

with All 0s and All 1s

Multiplying Feedthrough Error

–75

dB max

DAC Latch Loaded with All 0s

Output Capacitance

pF max

All 1s Loaded to DAC

pF max

All 0s Loaded to DAC

Digital Feedthrough

nV-s typ

Feedthrough to the DAC Output with

LD1, LD2

High and Alternate Loading of All 0s and All 1s

into the Input Shift Register

Digital Feedthrough (AD7945, AD7948)

nV-s typ

Feedthrough to the DAC Output with CS High

and Alternate Loading of All 0s and All 1s to the

DAC Bus

Total Harmonic Distortion

–83

dB typ

Output Noise Spectral Density

@ 1 kHz

nV/

√Hz typ

All 1s Loaded to DAC. VREF = 1.23 V

Specifications subject to change without notice.

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