AD5329 Datasheet, PDF (1/4 Pages) Analog Devices – Two’s Complement Dual, 12-Bit DACs

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Preliminary Technical Data
Two’s Complement
Dual, 12-Bit DACs
AD5329
FEATURES
• Monotonic DNL < ±1 LSB
• Improved Accuracy at Zero Scale
• Fast 2µs Settling Time
• Power ON Reset
• 3-Wire Serial Data Input
• 25MHz Data Load Rate
• Internal Reference Voltage
• +4.5V to +5.5V Single Supply Operation
APPLICATIONS
• Digital Control of Gain & Offset
GENERAL DESCRIPTION
The AD5329 is a serial-input, dual 12-bit digital-to-analog converter
that accepts two’s complement digital coding. An internal voltage
reference generates a stable 2V DACREF. The buffered DACREF
output generates the system bipolar ground reference at pin VBZ. The
bipolar DAC output swing programs over a 4VPP range. The device is
specified for operation from +5 volts ±10%.
Data is loaded MSB first on the positive clock edge (SCLK) when the
frame synch (FSYNC) input is active low. The serial clock input word
is 16-bits with the MSB position containing an address bit. The last 12
data bits clocked into the register will be transferred to the internal
DAC register when the strobe input is returned to logic high.
The output transfer equation is:
VOUT = [(D-2048) / 4096 * VDACREF] + VBZ
Where D is the 12-bit decimal data, and VOUT, VDACREF, VBZ are with
respect to ground.
The AD5329 is available in the compact 1.1mm thin µSOIC-10
package. All parts are guaranteed to operate over the industrial
temperature range of 0°C to +70°C.
PIN CONFIGURATION
V_DD 1
SDA 2
10 GND
9 SCLK
NC 3
8 FSYNC
Model
AD5329KRM-REEL7
V_OUTB 4
7 NC
V_OUTA 5
6 V_BZ
ORDERING GUIDE
RES Temp
(bits) Range
Package Package
Description Option
12
0/+70°C µSOIC-10 RM-10
FUNCTIONAL BLOCK DIAGRAM
V_DD
X2
GND
FSYNC
SCLK
SDI
+2V
+
V_{D A C R E F}
-
DECODER SW
DRIVER A
12
EN
ADDR
DAC A
DECODE
REGISTER
A0
16-Bit
SERIAL INPUT REGISTER
D11 ...............D0
AD5329
X2
DECODER SW
DRIVER B
12
DAC B
REGISTER
12
Power On
Reset
V_BZ (V_REF)
V_OUTA
V_BZ + 2V
V_BZ - 2V
V_OUTB
V_BZ + 2V
V_BZ - 2V
REV PrC, 20 DEC 99
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infringements of patents or other rights of third parties which may result from its use. No
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Devices.
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©Analog Devices, Inc., 1998