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參數(shù)資料
| 型號： | THS7002PWP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| 中文描述： | 70 - MHz的可編程增益放大器 |
| 文件頁數(shù)： | 3/32頁 |
| 文件大?。?/td> | 597K |
| 代理商： | THS7002PWP |
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THS7001, THS7002
70-MHz PROGRAMMABLE-GAIN AMPLIFIERS
SLOS214B – OCTOBER 1998 – REVISED AUGUST 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
block diagram
_
+
PREAMP VCC+
PREAMP A IN+
PREAMP A IN–
SHDN–A
SHDN–B
Preamp
PREAMP
OUT A
PGA–A
IN–
G2A
G1A
G0A
PGA–A REF
PGA
VCC+
PGA–B
GND
PGA
VCC–
CLAMP+ (VH)
CLAMP– (VL)
PGA–A OUT
_
+
_
PREAMP VCC–
PREAMP B IN–
PREAMP B IN+
Preamp
PREAMP
OUT B
PGA–B REF
PGA–B OUT
+
G2B
G1B
G0B
PGA–A
GND
_
+
PGA–B
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
0
0
–22
0.08
0
0
1
–16
0.16
0
1
0
–10
0.32
0
1
1
–4
0.63
1
0
0
2
1.26
1
0
1
8
2.52
1
1
0
14
5.01
1
1
1
20
10.0
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