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參數(shù)資料
| 型號： | AD7538KRZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 14BIT W/BUFF 24-SOIC |
| 產(chǎn)品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 31 |
| 設置時間： | 1.5µs |
| 位數(shù)： | 14 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 1W |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 1 電流，單極；1 電流，雙極 |
| 采樣率（每秒）： | 667k |
AD7538
Rev. B | Page 12 of 16
PROGRAMMABLE GAIN AMPLIFIER
The circuit shown in Figure 9 provides a programmable gain
amplifier (PGA). In it the DAC behaves as a programmable
resistance and thus allows the circuit gain to be digitally
controlled.
AD7538
N
IOUT
VDD
VSS
VOUT
VIN
VREF
GND
DIGITAL
INPUT
A
RFB
NOTES
1. RESISTOR RFB IS ACTUALLY
INCLUDED ON THE DICE.
01
13
9-
00
9
Figure 9. Programmable Gain Amplifier (PGA)
The transfer function of Figure 9 is:
FB
EQ
IN
OUT
R
V
Gain
=
(1)
REQ is the equivalent transfer impedance of the DAC from the
VREF pin to the IOUT pin and can be expressed as
N
R
IN
n
EQ
2
=
(2)
where:
n
is the resolution of the DAC.
N
is the DAC input code in decimal.
RIN
is the constant input impedance of the DAC (RIN = RLAD).
Substituting this expression into Equation 1 and assuming
zero gain error for the DAC (RIN = RFB), the transfer function
simplifies to
N
V
n
IN
OUT
2
=
(3)
The ratio N/2n is commonly represented by the term, D, and, as
such, is the fractional representation of the digital input word.
D
N
V
n
IN
OUT
1
2
=
=
(4)
Equation 4 indicates that the gain of the circuit can be varied
from 16,384 down to unity (actually 16,384/16,383) in 16,383
steps. The all 0s code is never applied. This avoids an open-loop
condition thereby saturating the amplifier. With the all 0s code
excluded there remains (2n – 1) possible input codes allowing a
choice of (2n – 1) output levels. In decibels the dynamic range is
(
)
dB
84
1
2
log
20
log
20
10
=
=
n
IN
OUT
V
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7538KRZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Microprocessor-Compatible 14-Bit DAC |
| AD7538KRZ-REEL | 功能描述:IC DAC 14BIT W/BUFF 24-SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 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 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數(shù)目和類型:* 采樣率（每秒）:* |
| AD7538KRZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Microprocessor-Compatible 14-Bit DAC |
| AD7538SQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| AD7538TQ | 制造商:Analog Devices 功能描述:DAC 1-CH R-2R 14-bit 24-Pin CDIP Tube 制造商:Analog Devices 功能描述:DAC 1CH R-2R 14BIT 24CDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:CMOS CONVERTER IC - Bulk 制造商:Analog Devices 功能描述:IC DAC 14BIT W/BUFF 24-CDIP 制造商:Analog Devices Inc. 功能描述:Digital to Analog Converters - DAC IC LC2MOS 14-bit uP-compatible 制造商:Analog Devices 功能描述:CONVERTER - DAC 制造商:Analog Devices 功能描述:DAC 14-Bit LC2MOS uP-Compatible CDIP24 |
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