參數(shù)資料
型號： AD5327BRUZ
廠商： Analog Devices Inc
文件頁數(shù)： 13/28頁
文件大小： 0K
描述： IC DAC 12BIT QUAD 2.5V 16-TSSOP
產(chǎn)品培訓模塊： Data Converter Fundamentals
DAC Architectures
標準包裝： 1
設置時間： 8µs
位數(shù)： 12
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
電壓電源： 單電源
功率耗散（最大）： 4.5mW
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 16-TSSOP
包裝： 管件
輸出數(shù)目和類型： 4 電壓，單極；4 電壓，雙極
采樣率（每秒）： 125k
產(chǎn)品目錄頁面： 782 (CN2011-ZH PDF)
AD5307/AD5317/AD5327
Rev. C | Page 20 of 28
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
The AD5307/AD5317/AD5327 can be used with a wide range
of reference voltages and offer full, one-quadrant multiplying
capability over a reference range of 0.25 V to VDD. More typically,
these devices are used with a fixed precision reference voltage.
Suitable references for 5 V operation are the AD780 and REF192
(2.5 V references). For 2.5 V operation, a suitable external refer-
ence would be the AD589, a 1.23 V band gap reference. Figure 41
shows a typical setup for the AD5307/AD5317/AD5327 when
using an external reference.
1F
10F
SCLK
DIN
GND
AD5307/AD5317/
AD5327
SERIAL
INTERFACE
EXT
REF
02
06
7-
04
1
VDD = 2.5V TO 5.5V
AD780/REF192
WITH VDD = 5V
OR AD589 WITH
VDD = 2.5V
VIN
VOUT
SYNC
VOUTA
VOUTB
VOUTC
VOUTD
VREFAB
VREFCD
0.1F
Figure 41. AD5307/AD5317/AD5327 Using a 2.5 V External Reference
DRIVING VDD FROM THE REFERENCE VOLTAGE
If an output range of 0 V to VDD is required when the reference
inputs are configured as unbuffered, the simplest solution is to
connect the reference input to VDD. Because this supply can be
noisy and not very accurate, the AD5307/AD5317/AD5327 can
be powered from the reference voltage, for example, from a 5 V
reference such as the REF195, which outputs a steady supply
voltage. The typical current required from the REF195 with no
load on the DAC outputs is 500 μA supply current and ≈112 μA
into the reference inputs (if unbuffered). When the DAC
outputs are loaded, the REF195 also needs to supply the current
to the loads. The total current required with a 10 kΩ load on
each output is
612 μA + 4 (5 V/10 kΩ) = 2.6 mA
The load regulation of the REF195 is typically 2 ppm/mA,
which results in an error of 5.2 ppm (26 μV) for the 2.6 mA
current drawn from it. This corresponds to a 0.0013 LSB error
at eight bits and a 0.021 LSB error at 12 bits.
BIPOLAR OPERATION
The AD5307/AD5317/AD5327 are designed for single-supply
operation, but a bipolar output range is also possible using the
circuit shown in Figure 42. This circuit provides an output
voltage range of 5 V. Rail-to-rail operation at the amplifier
output is achievable by using an AD820 or an OP295 as the
output amplifier.
The output voltage for any input code can be calculated as
follows:
(
)
/
(
1
)
(
2
/
R1
R2
REFIN
R
R2
R1
D
REFIN
V
N
OUT
×
+
×
=
where:
D is the decimal equivalent of the code loaded to the DAC.
N is the DAC resolution.
REFIN is the reference voltage input.
When REFIN = 5 V, R1 = R2 = 10 kΩ,
VOUT = (10 × D/2N) 5 V
+5V
AD820/
OP295
±5V
+5V
R1
10k
R2
10k
SCLK
GND
SERIAL
INTERFACE
–5V
+6V TO +16V
AD5307/AD5317/
AD5327
DIN
02
06
7-
0
42
SYNC
VOUTA
VOUTB
VOUTC
VOUTD
VREFAB
VREFCD
10F
0.1F
GND
REF195
VIN
VOUT
1F
VDD
Figure 42. Bipolar Operation with the AD5307/AD5317/AD5327
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