AD7943/AD7945/AD7948
NORMAL MODE
Parameter
DYNAMIC PERFORMANCE
Output Voltage Settling Time
AC PERFORMANCE CHARACTERISTICS
B Grades
600
T Grade
700
Units
ns typ
Test Conditions/Comments
To 0.01% of Full-Scale Range. V
REF
=
+10 V; DAC Latch Alternately Loaded with
All 0s and All 1s
Measured with V
REF
= 0 V. DAC Latch
Alternately Loaded with All 0s and All 1s
DAC Latch Loaded with All 0s
All 1s Loaded to DAC
All 0s Loaded to DAC
Feedthrough to the DAC Output with
LD1,
LD2
High and Alternate Loading of All 0s
and All 1s into the Input Shift Register
Feedthrough to the DAC Output with
CS
High and Alternate Loading of All 0s and
All 1s to the DAC Bus
(AD7943: V
DD
= +4.5 V to +5.5 V; V
IOUT1
= V
IOUT2
= AGND = 0 V. AD7945, AD7948: V
DD
= +4.5 V to +5.5 V; V
IOUT1
=AGND =
0 V. V
REF
= 6 V rms, 1 kHz sine wave; T
A
= T
MIN
to T
MAX
; DAC output op amp is AD843; unless otherwise noted.) These characteristics are in-
cluded for Design Guidance and are not subject to test.
Digital to Analog Glitch Impulse
Multiplying Feedthrough Error
Output Capacitance
Digital Feedthrough (AD7943)
60
–75
60
30
5
60
–75
60
30
5
nV-s typ
dB max
pF max
pF max
nV-s typ
Digital Feedthrough (AD7945, AD7948) 5
5
nV-s typ
Total Harmonic Distortion
Output Noise Spectral Density
@ 1 kHz
Specifications subject to change without notice.
–83
35
–83
35
dB typ
nV/√Hz typ All 1s Loaded to DAC. V
REF
= 0 V. Output
Op Amp Is OP07
AC PERFORMANCE CHARACTERISTICS
(AD7943: V
DD
= +3 V to +5.5 V; V
IOUT1
= V
IOUT2
= AGND = 1.23 V. AD7945, AD7948: V
DD
= +3 V to +5.5 V; V
IOUT1
= AGND =
1.23 V. V
REF
= 1 kHz, 2.45 V p-p, sine wave biased at 1.23 V; DAC output op amp is AD820; T
A
= T
MIN
to T
MAX
; unless otherwise noted.) These
characteristics are included for Design Guidance and are not subject to test.
Parameter
DYNAMIC PERFORMANCE
Output Voltage Settling Time
Digital to Analog Glitch Impulse
Multiplying Feedthrough Error
Output Capacitance
Digital Feedthrough
A Grades
5
60
–75
60
30
5
Units
µs
typ
nV-s typ
dB max
pF max
pF max
nV-s typ
Test Conditions/Comments
To 0.01% of Full-Scale Range. V
REF
= 0 V
DAC Latch Alternately Loaded with All 0s and All 1s
V
REF
= 1.23 V. DAC Register Alternately Loaded
with All 0s and All 1s
DAC Latch Loaded with All 0s
All 1s Loaded to DAC
All 0s Loaded to DAC
Feedthrough to the DAC Output with
LD1, LD2
High and Alternate Loading of All 0s and All 1s
into the Input Shift Register
Feedthrough to the DAC Output with CS High
and Alternate Loading of All 0s and All 1s to the
DAC Bus
BIASED MODE
Digital Feedthrough (AD7945, AD7948)
5
nV-s typ
Total Harmonic Distortion
Output Noise Spectral Density
@ 1 kHz
Specifications subject to change without notice.
–83
25
dB typ
nV/√Hz typ
All 1s Loaded to DAC. V
REF
= 1.23 V
–4–
REV. B
AD [ ANALOG DEVICES ]
