IDD – A FREQUENCY 300 350 600 400 450 50" />
參數資料
型號: AD5344BRU
廠商: Analog Devices Inc
文件頁數: 5/20頁
文件大?。?/td> 0K
描述: IC DAC 12BIT QUAD VOUT 28-TSSOP
產品培訓模塊: Data Converter Fundamentals
DAC Architectures
標準包裝: 50
設置時間: 8µs
位數: 12
數據接口: 并聯
轉換器數目: 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: 28-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 28-TSSOP
包裝: 管件
輸出數目和類型: 4 電壓,單極;4 電壓,雙極
采樣率(每秒): 125k
REV. 0
AD5334/AD5335/AD5336/AD5344
–13–
IDD – A
FREQUENCY
300
350
600
400
450
500
550
VDD = 5V
VDD = 3V
Figure 23. IDD Histogram with VDD =
3 V and VDD = 5 V
FULL-SCALE
ERROR
%FSR
0
–0.2
0
1
2
345
6
VDD = 5V
TA = 25 C
VREF – V
–0.1
0.1
0.2
0.3
0.4
Figure 26. Full-Scale Error vs. VREF
500ns/DIV
V
OUT
Volts
0.919
0.920
0.921
0.922
0.923
0.924
0.925
0.926
0.927
0.928
0.929
Figure 24. AD5344 Major-Code Tran-
sition Glitch Energy
750ns/DIV
1mV/DIV
Figure 27. DAC-DAC Crosstalk
FREQUENCY – kHz
10
–40
0.01
–20
–30
0
–10
dB
0.1
1
10
100
1k
10k
–50
–60
Figure 25. Multiplying Bandwidth
(Small-Signal Frequency Response)
FUNCTIONAL DESCRIPTION
The AD5334/AD5335/AD5336/AD5344 are quad resistor-
string DACs fabricated on a CMOS process with resolutions of
8, 10, 10, and 12 bits, respectively. They are written to using a
parallel interface. They operate from single supplies of 2.5 V to
5.5 V and the output buffer ampliers offer rail-to-rail output
swing. The gain of the buffer ampliers in the AD5334 and
AD5336 can be set to 1 or 2 to give an output voltage range of
0 to VREF or 0 to 2 VREF. The AD5335 and AD5344 have out-
put buffers with unity gain.
The devices have a power-down feature that reduces current
consumption to only 80 nA @ 3 V.
Digital-to-Analog Section
The architecture of one DAC channel consists of a reference
buffer and a resistor-string DAC followed by an output buffer
amplier. The voltage at the VREF pin provides the reference
voltage for the DAC. Figure 28 shows a block diagram of the
DAC architecture. Since the input coding to the DAC is
straight binary, the ideal output voltage is given by:
VV
D
Gain
OUT
REF
N
×
2
where:
D = decimal equivalent of the binary code which is loaded to
the DAC register:
0–255 for AD5334 (8 Bits)
0–1023 for AD5335/AD5336 (10 Bits)
0–4095 for AD5344 (12 Bits)
N = DAC resolution
Gain = Output Amplier Gain (1 or 2)
VOUT
GAIN
DAC
REGISTER
INPUT
REGISTER
RESISTOR
STRING
OUTPUT
BUFFER AMPLIFIER
VREF
Figure 28. Single DAC Channel Architecture
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