AD7945ARS-BREEL Datasheet, PDF (4/16 Pages) Analog Devices – +3.3 V/+5 V Multiplying 12-Bit DACs

AD7943/AD7945/AD7948
AC PERFORMANCE CHARACTERISTICS
NORMAL MODE (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. 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.
Parameter
DYNAMIC PERFORMANCE
Output Voltage Settling Time
B Grades
600
Digital to Analog Glitch Impulse
60
Multiplying Feedthrough Error
–75
Output Capacitance
60
30
Digital Feedthrough (AD7943)
5
Digital Feedthrough (AD7945, AD7948) 5
Total Harmonic Distortion
–83
Output Noise Spectral Density
@ 1 kHz
35
Specifications subject to change without notice.
T Grade
700
60
–75
60
30
5
5
–83
35
Units
Test Conditions/Comments
ns typ
nV-s typ
dB max
pF max
pF max
nV-s typ
nV-s typ
dB typ
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
nV/√Hz typ All 1s Loaded to DAC. V_REF = 0 V. Output
Op Amp Is OP07
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. 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
A Grades Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Output Voltage Settling Time
5
Digital to Analog Glitch Impulse
60
Multiplying Feedthrough Error
–75
Output Capacitance
60
30
Digital Feedthrough
5
Digital Feedthrough (AD7945, AD7948) 5
Total Harmonic Distortion
–83
Output Noise Spectral Density
@ 1 kHz
25
Specifications subject to change without notice.
µs typ
nV-s typ
dB max
pF max
pF max
nV-s typ
nV-s typ
dB typ
nV/√Hz typ
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
All 1s Loaded to DAC. V_REF = 1.23 V
–4–
REV. B