(V
DD
= +15 V, ⴞ 5%, V
SS
= –15 V, ⴞ 5%, V
REF
= +10 V, AGND = DGND = O V,
V
OUT
connected to R
FB
. V
OUT
load = 2 k⍀, 100 pF. All specifications T
MIN
to T
MAX
unless otherwise noted.)
REV. B–2–
AD7845–SPECIFICATIONS
1
Parameter J Version K Version A Version B Version S Version T Version Units Test Conditions/Comments
ACCURACY
Resolution 12 12 12 12 12 12 Bits 1 LSB =
V
REF
2
12
= 2.4 mV
Relative Accuracy
at +25°C ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 LSB max All Grades Are Guaranteed
T
MIN
to T
MAX
±1 ±3/4 ±1 ±3/4 ±1 ±3/4 LSB max Monotonic over Temperature
Differential Nonlinearity ±1 ±1 ±1 ±1 ±1 ±1 LSB max DAC Register Loaded with
Zero Code Offset Error All 0s.
at +25°C ±2 ±1 ±2 ±1 ±2 ±1mV max
T
MIN
to T
MAX
±3 ±2 ±3 ±2 ±4 ±3mV max
Offset Temperature Coefficient;
(∆Offset/∆Temperature)
2
±5 ±5 ±5 ±5 ±5 ±5 µV/°C typ
Gain Error ±3 ±2 ±3 ±2 ±3 ±2 LSB max R
FB
, V
OUT
Connected
±6 ±6 ±6 ±6 ±6 ±6 LSB max R
C
, V
OUT
Connected, V
REF
= +5 V
±6 ±6 ±6 ±6 ±6 ±6 LSB max R
B
, V
OUT
Connected, V
REF
= +5 V
±7 ±7 ±7 ±7 ±7 ±7 LSB max R
A
, V
OUT
Connected, V
REF
= +2.5 V
Gain Temperature Coefficient;
(∆Gain/∆Temperature)
2
±2 ±2 ±2 ±2 ±2 ±2 ppm of FSR/°CR
FB
, V
OUT
Connected
typ
REFERENCE INPUT
Input Resistance, Pin 17 8888 88 kΩ min Typical Input Resistance = 12 kΩ
16 16 16 16 16 16 kΩ max
APPLICATION RESISTOR
RATIO MATCHING 0.5 0.5 0.5 0.5 0.5 0 5 % max Matching Between R
A
, R
B
, R
C
DIGITAL INPUTS
V
IH
(Input High Voltage) 2.4 2.4 2.4 2.4 2.4 2.4 V min
V
IL
(Input Low Voltage) 0.8 0.8 0.8 0.8 0.8 0.8 V max
I
IN
(Input Current) ±1 ±1 ±1 ±1 ±1 ±1 µA max Digital Inputs at 0 V and V
DD
C
IN
(Input Capacitance)
2
7777 77 pF max
POWER SUPPLY
4
V
DD
Range 14.25/15.75 14.25/15.75 14.25/15.75 14.25/15.75 14.25/15.75 14.25/15.75 V min/V max
V
SS
Range –14.25/–15.75 –14.25/–15.75 –14.25/–15.75 –14.25/–15.75 –14.25/–15.75 –14.25/–15.75 V min/V max
Power Supply Rejection
∆Gain/∆V
DD
±0.01 ±0.01 ±0.01 ±0.01 ±0.01 ±0.01 % per % max V
DD
= +15 V ± 5%, V
REF
= –10 V
∆Gain/∆V
SS
±0.01 ±0.01 ±0.01 ±0.01 ±0.01 ±0.01 % per % max V
SS
= –15 V ± 5%.
I
DD
6666 66 mA maxV
OUT
Unloaded
I
SS
4444 44 mA maxV
OUT
Unloaded
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for Design Guidance and are not subject to test.
DYNAMIC PERFORMANCE
Output Voltage Settling Time 5555 55 µs max To 0.01% of Full-Scale Range
V
OUT
Load = 2 kΩ, 100 pF.
DAC Register Alternately Loaded
with All 0s and All 1s. Typically
2.5 µs at 25°C.
Slew Rate 11 11 11 11 11 11 V/µs typ V
OUT
Load = 2 kΩ, 100 pF.
Digital-to-Analog 55 55 55 55 55 55 nV–s typ Measured with V
REF
= 0 V.
Glitch Impulse DAC Register Alternately Loaded
with All 0s and All 1s.
Multiplying Feedthrough 5555 55 mV p-p typ V
REF
= ±10 V, 10 kHz Sine Wave
Error
3
DAC Register Loaded with All 0s.
Unity Gain Small Signal
Bandwidth 600 600 600 600 600 600 kHz typ V
OUT
, R
FB
Connected. DAC Loaded
with All 1s V
REF
= 100 mV p-p
Sine Wave.
Full Power Bandwidth 175 175 175 175 175 175 kHz typ V
OUT
, R
FB
Connected. DAC Loaded
with All 1s. V
REF
= 20 V p-p
Sine Wave. R
L
= 2 kΩ.
Total Harmonic Distortion –90 –90 –90 –90 –90 –90 dB typ V
REF
= 6 V rms, 1 kHz Sine Wave.
OUTPUT CHARACTERISTICS
5
Open Loop Gain 85 85 85 85 85 85 dB min V
OUT
, R
FB
Not Connected
V
OUT
= ±10 V, R
L
= 2 kΩ
Output Voltage Swing ±10 ±10 ±10 ±10 ±10 ±10 V min R
L
= 2 kΩ, C
L
= 100 pF
Output Resistance 0.2 0.2 0.2 0.2 0.2 0.2 Ω typ R
FB
, V
OUT
Connected,
Short Circuit Current @ +25°C 11 11 11 11 11 11 mA typ V
OUT
Shorted to AGND
Output Noise Voltage Includes Noise Due to Output
(0.1 Hz to 10 Hz) @ +25°C2222 22 µV rms typ Amplifier and Johnson Noise
f = 10 Hz 250 250 250 250 250 250 nV/√Hz typ of R
FB
f = 100 Hz 100 100 100 100 100 100 nV/√Hz typ
f = 1 kHz 50 50 50 50 50 50 nV/√Hz typ
f = 10 kHz 50 50 50 50 50 50 nV/√Hz typ
f = 100 kHz 50 50 50 50 50 50 nV/√Hz typ
NOTES
1
Temperature ranges are as follows: J, K Versions: 0°C to +70°C; A, B Versions: –40°C to +85°C; S, T Versions: –55°C to +125°C.
2
Guaranteed by design and characterization, not production tested.
3
The metal lid on the ceramic D-24A package is connected to Pin 12 (DGND).
4
The device is functional with a power supply of ± 12 V.
5
Minimum specified load resistance is 2 kΩ.
Specifications subject to change without notice.
