REV.
–2–
AD7537–SPECIFICATIONS
(V
DD
= +12 V to +15 V, ⴞ10%, V
REFA
= V
REFB
= 10 V; I
OUTA
= AGND = 0 V,
I
OUTB
= AGNDB = 0 V. All specifications T
MIN
to T
MAX
unless otherwise noted.)
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for Design Guidance only and are not subject to test.
(V
DD
= +12 V to +15 V; V
REFA
= V
REFB
= +10 V; I
OUTA
= AGNDA = 0 V, I
OUTB
= AGNDB = 0 V. Output Amplifiers are AD644 except where noted.)
Parameter T
A
= +25ⴗCT
A
= T
MIN
, T
MAX
Units Test Conditions/Comments
Output Current Settling Time 1.5 μs max To 0.01% of full-scale range. I
OUT
load = 100 Ω, C
EXT
= 13 pF.
DAC output measured from falling edge of
WR.
Typical Value of Settling Time is 0.8 μs.
Digital-to-Analog Glitch lmpulse 7 nV-s typ Measured with V
REFA
= V
REFB
= 0 V. I
OUTA
, I
OUTB
load = 100 Ω,
C
EXT
= 13 pF. DAC registers alternately loaded with all 0s and all 1s.
AC Feedthrough
4
V
REFA
to I
OUTA
–70 –65 dB max V
REFA
, V
REFB
= 20 V p-p 10 kHz sine wave.
V
REFB
to I
OUTB
–70 –65 dB max DAC registers loaded with all 0s.
Power Supply Rejection
ΔGain/ΔV
DD
±0.01 ±0.02 % per % max ΔV
DD
= V
DD
max – V
DD
min
Output Capacitance
C
OUTA
70 70 pF max DAC A, DAC B loaded with all 0s
C
OUTB
70 70 pF max
C
OUTA
140 140 pF max DAC A, DAC B loaded with all 1s
C
OUTB
140 140 pF max
Channel-to-Channel Isolation
V
REFA
to I
OUTB
–84 dB typ V
REFA
= 20 V p-p 10 kHz sine wave, V
REFB
= 0 V.
Both DACs loaded with all 1s.
V
REFB
to I
OUTA
–84 dB typ V
REFB
= 20 V p-p 10 kHz sine wave, V
REFA
= 0 V.
Both DACs loaded with all 1s.
Digital Crosstalk 7 nV-s typ Measured for a Code Transition of all 0s to all 1s.
I
OUTA
, I
OUTB
load = 100 Ω, C
EXT
= 13 pF.
Output Noise Voltage Density 25 nV/√
Hz typ Measured between R
FBA
and I
OUTA
or R
FBB
and I
OUTB.
(10 Hz–100 kHz) Frequency of measurement is 10 Hz–100 kHz.
Total Harmonic Distortion –82 dB typ V
IN
= 6 V rms, 1 kHz. Both DACs loaded with all 1s.
NOTES
1
Temperature range as follows: J, K, L Versions: –40°C to +85°C;
A, B, C Versions: –40°C to +85°C;
S, T, U Versions: –55°C to +125°C
Specifications subject to change without notice.
2
Sample tested at +25°C to ensure compliance.
3
Functional at V
DD
= 5 V, with degraded specifications.
4
Pin 12 (DGND) on ceramic DIPs is connected to lid.
J, A K, B L, C S T U
Parameter Versions Versions Versions Version Version Version Units Test Conditions/Comments
ACCURACY
Resolution 12 12 12 12 12 12 Bits
Relative Accuracy ±1 ±1/2 ± 1/2 ±1 ±1/2 ± 1/2 LSB max
Differential Nonlinearity ±1 ±1 ±1 ±1 ±1 ±1 LSB max All grades guaranteed mono-
tonic over temperature.
Gain Error ±6 ±3 ±1 ±6 ±3 ±2 LSB max Measured using R
FBA
, R
FBB
.
Both DAC registers loaded
with all 1s.
Gain Temperature Coefficient
2
;
ΔGain/ΔTemperature ±5 ±5 ±5 ±5 ±5 ±5 ppm/°C max Typical value is 1 ppm/°C
Output Leakage Current
I
OUTA
+25°C 10 10 10 10 10 10 nA max DAC A Register loaded
T
MIN
to T
MAX
150 150 150 250 250 250 nA max with all 0s
I
OUTB
+25°C 10 10 10 10 10 10 nA max DAC B Register loaded
T
MIN
to T
MAX
150 150 150 250 250 250 nA max with all 0s
REFERENCE INPUT
Input Resistance 999999kΩ min Typical Input Resistance = 14 kΩ
20 20 20 20 20 20 kΩ max
V
REFA
, V
REFB
Input Resistance Match ± 3 ± 3 ± 1 ± 3 ± 3 ± 1 % max Typically ±0.5%
DIGITAL INPUTS
V
IH
(lnput High Voltage) 2.4 2.4 2.4 2.4 2.4 2.4 V min
V
IIL
(Input Low Voltage) 0.8 0.8 0.8 0.8 0.8 0.8 V max
I
IN
(Input Current)
+25°C ±1 ±1 ±1 ±1 ±1 ±1 μA max V
IN
= V
DD
T
MIN
to T
MAX
±10 ±10 ±10 ±10 ±10 ±10 μA max
C
IN
(lnput Capacitance)
2
10 10 10 10 10 10 pF max
POWER SUPPLY
3
V
DD
10.8/16.5 10.8/16.5 10.8/16.5 10.8/16.5 10.8/16.5 10.8/16.5 V min/V max
I
DD
222222mA max
