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Analog Devices Semiconductor Electronic Components Datasheet

AD8522 Datasheet

+5 Volt/ Serial Input/ Dual 12-Bit DAC

No Preview Available !

AD8522 pdf
a
FEATURES
Complete Dual 12-Bit DAC
No External Components
+5 V Single-Supply Operation ؎10%
4.095 V Full Scale (1 mV/LSB)
Buffered Voltage Outputs
Low Power: 5 mW/DAC
Space Saving 1.5 mm Height SO-14 Package
APPLICATIONS
Digitally Controlled Calibration
Servo Controls
Process Control Equipment
Computer Peripherals
Portable Instrumentation
Cellular Base Stations Voltage Adjustment
+5 Volt, Serial Input,
Dual 12-Bit DAC
AD8522
FUNCTIONAL BLOCK DIAGRAM
VDD
CS
CLK
CLK
LATCH
SDI
(DATA)
SHIFT
REGISTER
DAC A
REGISTER
D
12
DAC A
12
BANDGAP
REFERENCE
OP
AMP
A
REF
BUF
SDO
LDA
LDB
CONTROL
LOGIC
D
DAC B
REGISTER
12
REF
BUF
DAC B
AD8522
OP
AMP
B
DGND
MSB RS
AGND
VOUTA
VREF
VOUTB
GENERAL DESCRIPTION
The AD8522 is a complete dual 12-bit, single-supply, voltage
output DAC in a 14-pin DIP, or SO-14 surface mount package.
Fabricated in a CBCMOS process, features include a serial digi-
tal interface, onboard reference, and buffered voltage output.
Ideal for +5 V-only systems, this monolithic device offers low
cost and ease of use, and requires no external components to
realize the full performance of the device.
The serial digital interface allows interfacing directly to numer-
ous microcontroller ports, with a simple high speed, three-wire
data, clock, and load strobe format. The 16-bit serial word con-
tains the 12-bit data word and DAC select address, which is de-
coded internally or can be decoded externally using LDA, LDB
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
VDD = +4.5V
TA = –55°C, +25°C, +85°C, +125°C
+25°C
–55°C
+85°C
+125°C
1024
2048
3072
4096
DIGITAL INPUT CODE – Decimal
Figure 1. Linearity Error vs. Digital Code & Temperature
inputs. A serial data output allows the user to easily daisy-chain
multiple devices in conjunction with a chip select input. A reset
RS input sets the outputs to zero scale or midscale, as deter-
mined by the input MSB.
The output 4.095 V full scale is laser trimmed to maintain accu-
racy over the operating temperature range of the device, and
gives the user an easy-to-use one-millivolt-per-bit resolution. A
2.5 V reference output is also available externally for other data
acquisition circuitry, and for ratiometric applications. The out-
put buffers are capable of driving ± 5 mA.
The AD8522 is available in the 14-pin plastic DIP and low pro-
file 1.5 mm SOIC-14 packages.
PACKAGE TYPES AVAILABLE
SO-14
PDIP-14
REV. A
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: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD8522 Datasheet

+5 Volt/ Serial Input/ Dual 12-Bit DAC

No Preview Available !

AD8522 pdf
AD8522–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (@ VDD = +5.0 V ؎ 10%, RL = No Load, –40؇C TA +85؇C, both DACs tested, unless
otherwise noted)
Parameter
Symbol Condition
Min Typ Max Units
STATIC PERFORMANCE
Resolution1
Relative Accuracy
Differential Nonlinearity
Zero-Scale Error
Full-Scale Voltage2
Full-Scale Tempco2, 3
MATCHING PERFORMANCE
Linearity Matching Error
ANALOG OUTPUT
Output Current
Load Regulation at Half-Scale
Capacitive Load3
REFERENCE OUTPUT
Output Voltage
Output Source Current4
Line Rejection
Load Regulation
LOGIC INPUTS & OUTPUTS
Logic Input Low Voltage
Logic Input High Voltage
Input Leakage Current
Input Capacitance3
Logic Output Voltage Low
Logic Output Voltage High
TIMING SPECIFICATIONS3, 5
Clock Width High
Clock Width Low
Load Pulse Width
Data Setup
Data Hold
Clear Pulse Width
Load Setup
Load Hold
Select
Deselect
Clock to SDO Propagation Delay
AC CHARACTERISTICS3, 5
Voltage Output Settling Time6
Crosstalk
N
INL
DNL
VZSE
VFS
TCVFS
VFSA/B
IOUT
LDREG
CL
VREF
IREF
LNREJ
LDREG
VIL
VIH
IIL
CIL
VOL
VOH
tCH
tCL
tLDW
tDS
tDH
tCLRW
tLD1
tLD2
tCSS
tCSH
tPD
tS
CT
DAC Glitch
Digital Feedthrough
Q
DFT
Monotonic
Data = 000H
Data = FFFH
Data = 800H, VOUT 3 LSB
RL = 402 to , Data = 800H
No Oscillation
VREF < 18 mV
IREF = 0 to 5 mA, Data = 800H
IOL = 1.6 mA
IOH = 400 µA
To ± 1 LSB of Final Value
Signal Measured at DAC Output,
While Changing Opposite LDA/B
Half-Scale Transition
Signal Measured at DAC Output,
While Changing Data Without LDA/B
12
-1.5
-1
4.079
± 0.5
± 0.5
+0.5
4.095
± 15
+1.5
+1
+3
4.111
Bits
LSB
LSB
mV
Volts
ppm/°C
± 1 LSB
±5
13
500
mA
LSB
pF
2.484
2.500
0.025
0.025
2.516
5
0.08
0.1
V
mA
%/V
%/mA
0.8 V
2.4 V
10 µA
10 pF
0.4 V
3.5 V
35 ns
35 ns
25 ns
10 ns
20 ns
20 ns
10 ns
10 ns
30 ns
30 ns
20 45 80 ns
16 µs
38 dB
13 nV s
2 nV s
SUPPLY CHARACTERISTICS
Positive Supply Current
Power Dissipation7
Power Supply Sensitivity
IDD
PDISS
PSS
VDD = 5.5 V, VIH = 2.4 V or VIL = 0.8 V
VDD = 5 V, VIL = 0 V
VDD = 5 V, VIH = 2.4 V or VIL = 0.8 V
VDD = 5 V, VIL = 0 V
VDD = ± 5%
3
1
15
5
0.002
5
2
25
10
0.004
mA
mA
mW
mW
%/%
NOTES
11 LSB = 1 mV for 0 V to +4.095 V output range.
2Includes internal voltage reference error.
3These parameters are guaranteed by design and not subject to production testing.
4Very little sink current is available at the VREF pin. Use external buffer if setting up a virtual ground.
5All input control signals are specified with tr = tf = 5 ns (10% to 90% of +5 V) and timed from a voltage level of 1.6 V.
6The settling time specification does not apply for negative going transitions within the last 6 LSBs of ground. Some devices exhibit double the typical settling time in this 6 LSB region.
7Power Dissipation is calculated IDD × 5 V.
Specifications subject to change without notice.
–2– REV. A


Part Number AD8522
Description +5 Volt/ Serial Input/ Dual 12-Bit DAC
Maker Analog Devices
Total Page 8 Pages
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