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參數(shù)資料
| 型號(hào)： | AD7399BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Quad, Serial-Input 12-Bit/10-Bit DACs |
| 中文描述： | SERIAL INPUT LOADING, 6 us SETTLING TIME, 10-BIT DAC, PDSO16 |
| 封裝： | MS-013AA, WSOIC-16 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 273K |
| 代理商： | AD7399BR |
REV. 0
AD7398/AD7399
–12–
CIRCUIT OPERATION
The AD7398 and AD7399 contain four, 12-bit and 10-bit,
voltage-output, digital-to-analog converters respectively. Each
DAC has its own independent multiplying reference input. Both
AD7398/AD7399 use 3-wire SPI-compatible serial data interface,
with an asynchronous
RS
pin for zero-scale reset. In addition, a
LDAC
strobe enables four channel simultaneous updates for
hardware synchronized output voltage changes.
D/A Converter Section
GND
V
DD
V
OUT
A
V
REF
R
V
SS
AD7398/AD7399
R
Figure 5. Simplified DAC Channel
DAC OPERATION
The internal R-2R ladder of the AD7398 and AD7399 operate
in the voltage switching mode maintaining an output voltage
that is the same polarity as the input reference voltage. A propri-
etary scaling technique is used to attenuate the input reference
voltage in the DAC. The output buffer amplifies the internal
DAC output to achieve a V
REF
to V
OUT
gain of unity.
The nominal DAC output voltage is determined by the exter-
nally applied V
REF
and the digital data (D) as:
V
V
D
OUT
REF
=
×
4096
(For AD7398)
(1)
V
V
D
OUT
REF
=
×
1024
(For AD7399)
(2)
Where
D
is the 12-bit or 10-bit decimal equivalent of the data
word.
V
REF
is the externally applied reference voltage.
In order to maintain good analog performance, bypass power
supplies with 0.01
μ
F ceramic capacitors (mount them close to
the supply pins) and 1
μ
F
–
10
μ
F Tantalum capacitors in paral-
lel. In additions, clean power supplies with low ripple voltage
capability should be used. Switching power supplies may be
used for this application but beware of its higher ripple voltage
and PSS frequency-dependent characteristics. It is also best to
supply the AD7398/AD7399
’
s power from the system
’
s analog
supply voltages. (Don
’
t use the digital 5 V supply).
The reference input resistance is code dependent exhibiting
worst case 35 k
for AD7398 when the DAC is loaded with
alternating codes 010101010101. Similarly, the reference input
resistance is 40 k
for AD7399 when the DAC is loaded with
0101010101.
OPERATION WITH V
REF
EQUAL TO THE SUPPLY
The AD7398/AD7399 is designed to approach the full output
voltage swing from ground to V
DD
or V
SS
. The maximum output
swing is achieved when the corresponding V
REF
input pin is tied
to the same power supply. This power supply should be low
noise and low ripple, preferably operated by a suitable reference
voltage source such as ADR292 and REF02. The output swing
CLK
GND
V
DD
CS
SDI
DAC
REGISTER
POWER
ON RESET
DAC
REGISTER
DAC
REGISTER
DAC
REGISTER
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
A
V
REF
C D
LDAC
RS
V
SS
12/10
B
DAC A
DAC B
DAC C
DAC D
ADDRESS
DECODE
SERIAL
REGISTER
INPUT
REGISTER
INPUT
REGISTER
INPUT
REGISTER
INPUT
REGISTER
4
AD7398/AD7399
Figure 4. Simplified Block Diagram
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|---|---|
| AD7399BR | 制造商:Analog Devices 功能描述:CONVERTOR AD ((NW)) |
| AD7399BR-REEL | 功能描述:IC DAC 10BIT QUAD SRL 16-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,400 系列:- 設(shè)置時(shí)間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應(yīng)商設(shè)備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| AD7399BR-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad, Serial-Input 12-Bit/10-Bit DACs |
| AD7399BRU | 功能描述:IC DAC 10BIT QUAD SRL 16-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,400 系列:- 設(shè)置時(shí)間:- 位數(shù):18 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:3 電壓電源:模擬和數(shù)字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應(yīng)商設(shè)備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| AD7399BRU-REEL | 制造商:Analog Devices 功能描述: |
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