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AD7845 Datasheet

LC2MOS Complete 12-Bit Multiplying DAC

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a
LC2MOS
Complete 12-Bit Multiplying DAC
AD7845
FEATURES
12-Bit CMOS MDAC with Output Amplifier
4-Quadrant Multiplication
Guaranteed Monotonic (TMIN to TMAX)
Space-Saving 0.3" DIPs and 24- or 28-Terminal Surface
Mount Packages
Application Resistors On Chip for Gain Ranging, etc.
Low Power LC2MOS
APPLICATIONS
Automatic Test Equipment
Digital Attenuators
Programmable Power Supplies
Programmable Gain Amplifiers
Digital-to-4–20 mA Converters
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD7845 is the industry’s first 4-quadrant multiplying D/A
converter with an on-chip amplifier. It is fabricated on the
LC2MOS process, which allows precision linear components
and digital circuitry to be implemented on the same chip.
The 12 data inputs drive latches which are controlled by stan-
dard CS and WR signals, making microprocessor interfacing
simple. For stand-alone operation, the CS and WR inputs can
be tied to ground, making all latches transparent. All digital
inputs are TTL and 5 V CMOS compatible.
The output amplifier can supply ± 10 V into a 2 kload. It is
internally compensated, and its input offset voltage is low due to
laser trimming at wafer level. For normal operation, RFB is tied
to VOUT, but the user may alternatively choose RA, RB or RC to
scale the output voltage range.
PRODUCT HIGHLIGHTS
1. Voltage Output Multiplying DAC
The AD7845 is the first DAC which has a full 4-quadrant
multiplying capability and an output amplifier on chip. All
specifications include amplifier performance.
2. Matched Application Resistors
Three application resistors provide an easy facility for gain
ranging, voltage offsetting, etc.
3. Space Saving
The AD7845 saves space in two ways. The integration of the
output amplifier on chip means that chip count is reduced.
The part is housed in skinny 24-lead 0.3" DIP, 28-terminal
LCC and PLCC and 24-terminal SOIC packages.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999


Analog Devices Semiconductor Electronic Components Datasheet

AD7845 Datasheet

LC2MOS Complete 12-Bit Multiplying DAC

No Preview Available !

AD7845–SPECIFICATIONS1
(VDD = +15 V, ؎ 5%, VSS = –15 V, ؎ 5%, VREF = +10 V, AGND = DGND = O V,
VOUT connected to RFB. VOUT load = 2 k, 100 pF. All specifications TMIN to TMAX unless otherwise noted.)
Parameter
J Version
K Version A Version B Version
S Version T Version
Units
Test Conditions/Comments
ACCURACY
Resolution
Relative Accuracy
at +25°C
TMIN to TMAX
Differential Nonlinearity
Zero Code Offset Error
at +25°C
TMIN to TMAX
Offset Temperature Coefficient;
(Offset/Temperature)2
Gain Error
Gain Temperature Coefficient;
(Gain/Temperature)2
12
±1
±1
±1
±2
±3
±5
±3
±6
±6
±7
±2
12 12
±1/2 ±1
±3/4 ±1
±1 ±1
±1 ±2
±2 ±3
±5 ±5
±2 ±3
±6 ±6
±6 ±6
±7 ±7
±2 ±2
12 12
±1/2 ±1
±3/4 ±1
±1 ±1
±1 ±2
±2 ±4
±5 ±5
±2 ±3
±6 ±6
±6 ±6
±7 ±7
±2 ±2
VREF
12
Bits
1 LSB =
= 2.4 mV
212
± 1/2
LSB max
All Grades Are Guaranteed
± 3/4
LSB max
Monotonic over Temperature
±1
LSB max
DAC Register Loaded with
All 0s.
±1 mV max
±3 mV max
±5 µV/°C typ
±2
LSB max
RFB, VOUT Connected
±6
LSB max
RC, VOUT Connected, VREF = +5 V
±6
LSB max
RB, VOUT Connected, VREF = +5 V
±7
LSB max
RA, VOUT Connected, VREF = +2.5 V
±2 ppm of FSR/°C RFB, VOUT Connected
typ
REFERENCE INPUT
Input Resistance, Pin 17
8
8
8
8
16 16 16 16
88
16 16
kmin
kmax
Typical Input Resistance = 12 k
APPLICATION RESISTOR
RATIO MATCHING
0.5
0.5
0.5
0.5
0.5 0 5
% max
Matching Between RA, RB, RC
DIGITAL INPUTS
VIH (Input High Voltage)
VIL (Input Low Voltage)
IIN (Input Current)
CIN (Input Capacitance)2
POWER SUPPLY4
VDD Range
VSS Range
Power Supply Rejection
Gain/VDD
Gain/VSS
IDD
ISS
2.4 2.4 2.4 2.4
0.8 0.8 0.8 0.8
±1 ±1 ±1 ±1
7777
2.4 2.4
0.8 0.8
±1 ±1
77
V min
V max
µA max
pF max
Digital Inputs at 0 V and VDD
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
–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
± 0.01
± 0.01
6
4
± 0.01
± 0.01
6
4
± 0.01
± 0.01
6
4
± 0.01
± 0.01
6
4
± 0.01
± 0.01
6
4
± 0.01
± 0.01
6
4
% per % max
% per % max
mA max
mA max
VDD = +15 V ± 5%, VREF = –10 V
VSS = –15 V ± 5%.
VOUT Unloaded
VOUT Unloaded
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for Design Guidance and are not subject to test.
DYNAMIC PERFORMANCE
Output Voltage Settling Time 5 5 5 5
5
5
Slew Rate
Digital-to-Analog
Glitch Impulse
11 11 11 11
55 55 55 55
Multiplying Feedthrough
5
5
5
5
Error3
Unity Gain Small Signal
Bandwidth
600 600 600 600
11 11
55 55
55
600 600
Full Power Bandwidth
175
175
175
175
175 175
Total Harmonic Distortion –90 –90 –90 –90
OUTPUT CHARACTERISTICS5
Open Loop Gain
85 85 85 85
–90 –90
85 85
Output Voltage Swing
± 10
± 10
± 10
± 10
Output Resistance
0.2 0.2 0.2 0.2
Short Circuit Current @ +25°C 11 11 11 11
Output Noise Voltage
(0.1 Hz to 10 Hz) @ +25°C 2 2 2 2
f = 10 Hz
250 250 250 250
f = 100 Hz
100 100 100 100
f = 1 kHz
50 50 50 50
f = 10 kHz
50 50 50 50
f = 100 kHz
50 50 50 50
±10 ±10
0.2 0.2
11 11
22
250 250
100 100
50 50
50 50
50 50
NOTES
1Temperature 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.
2Guaranteed by design and characterization, not production tested.
3The metal lid on the ceramic D-24A package is connected to Pin 12 (DGND).
4The device is functional with a power supply of ± 12 V.
5Minimum specified load resistance is 2 k.
Specifications subject to change without notice.
–2–
µs max
V/µs typ
nV–s typ
mV p-p typ
kHz typ
kHz typ
dB typ
dB min
V min
typ
mA typ
µV rms typ
nV/Hz typ
nV/Hz typ
nV/Hz typ
nV/Hz typ
nV/Hz typ
To 0.01% of Full-Scale Range
VOUT Load = 2 k, 100 pF.
DAC Register Alternately Loaded
with All 0s and All 1s. Typically
2.5 µs at 25°C.
VOUT Load = 2 k, 100 pF.
Measured with VREF = 0 V.
DAC Register Alternately Loaded
with All 0s and All 1s.
VREF = ±10 V, 10 kHz Sine Wave
DAC Register Loaded with All 0s.
VOUT, RFB Connected. DAC Loaded
with All 1s VREF = 100 mV p-p
Sine Wave.
VOUT, RFB Connected. DAC Loaded
with All 1s. VREF = 20 V p-p
Sine Wave. RL = 2 k.
VREF = 6 V rms, 1 kHz Sine Wave.
VOUT, RFB Not Connected
VOUT = ±10 V, RL = 2 k
RL = 2 k, CL = 100 pF
RFB, VOUT Connected,
VOUT Shorted to AGND
Includes Noise Due to Output
Amplifier and Johnson Noise
of RFB
REV. B


Part Number AD7845
Description LC2MOS Complete 12-Bit Multiplying DAC
Maker Analog Devices
Total Page 12 Pages
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