參數(shù)資料
型號: THS7002CPWP
廠商: TEXAS INSTRUMENTS INC
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO28
封裝: GREEN, PLASTIC, HTSSOP-28
文件頁數(shù): 23/41頁
文件大小: 1203K
代理商: THS7002CPWP
THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
block diagram
_
+
PREAMP VCC+
PREAMP A IN+
PREAMP A IN
SHDNA
Preamp
PREAMP
OUT A
PGAA
IN
G2A
G1A
G0A
PGAA REF
PGA
VCC+
PGAB
GND
PGA
VCC
CLAMP+ (VH)
CLAMP (VL)
PGAA OUT
_
+
_
PREAMP VCC
PREAMP B IN
PREAMP B IN+
SHDNB
Preamp
PREAMP
OUT B
PGAB REF
PGAB OUT
+
G2B
G1B
G0B
PGAA
GND
_
+
PGAB
IN
Figure 2. THS7002 Dual Channel PGA
input preamp
To achieve the minimum input equivalent noise required for very small input signals, the input preamp is
configured as a classic voltage feedback amplifier with a minimum gain of 2 or 1. The output of the preamp
is accessible, allowing for adjustment of gain using external resistors and for external filtering between the
preamp and the PGA.
programmable gain amplifier (PGA)
The PGA is an inverting, programmable gain amplifier. The gain is digitally programmable using three control
bits (TTL-compatible terminals) that are encoded to provide eight distinct levels of gain/attenuation. Nominal
gain/attenuation is shown in Table 1.
Table 1. Nominal Gain/Attenuation
G2
G1
G0
PGA GAIN
(dB)
PGA GAIN
(V/V)
0
22
0.08
0
1
16
0.16
0
1
0
10
0.32
0
1
4
0.63
1
0
2
1.26
1
0
1
8
2.52
1
0
14
5.01
1
20
10.0
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