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參數(shù)資料
| 型號： | MAX108 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | 【5V, 1.5Gsps, 8-Bit ADC with On-Chip 2.2GHz Track/Hold Amplifier |
| 中文描述： | ±5V、1.5Gsps、8位、超高速、ADC，帶有片上2.2GHz采樣/保持放大器 |
| 文件頁數(shù)： | 17/32頁 |
| 文件大?。?/td> | 428K |
| 代理商： | MAX108 |
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In a typical single-ended configuration, the analog
input signal (Figure 10a) enters the T/H amplifier stage
at the in-phase input (VIN+), while the inverted phase
input (VIN-) is reverse-terminated to GNDI with an
external 50
resistor. Single-ended operation allows for
an input amplitude of ±250mV. Table 3 shows a selec-
tion of input voltages and their corresponding output
codes for single-ended operation.
Differential Analog Inputs
To obtain a full-scale digital output with differential input
drive (Figure 10b), 250mVp-p must be applied between
VIN+ and VIN- (VIN+ = +125mV, and VIN- = -125mV).
Midscale digital output codes (01111111 or 10000000)
occur when there is no voltage difference between
VIN+ and VIN-. For a zero-scale digital output code, the
in-phase (VIN+) input must see -125mV and the invert-
ed input (VIN-) must see +125mV. A differential input
drive is recommended for best performance. Table 4
represents a selection of differential input voltages and
their corresponding output codes.
M
±5V, 1.5Gsps, 8-Bit ADC with
On-Chip 2.2GHz Track/Hold Amplifier
______________________________________________________________________________________
17
+2.8V
50
50
VIN+
ANALOG INPUTS ARE ESD PROTECTED
(NOT SHOWN IN THIS SIMPLIFIED DRAWING).
VIN-
GNDI
V
EE
Figure 9. Simplified Analog Input Structure (Single-Ended/
Differential)
V
IN+
V
IN-
0V
+250mV
-250mV
t
500mVp-p
FS ANALOG
INPUT RANGE
V
IN
= ±250mV
500mV
Figure 10a. Single-Ended Analog Input Signals
V
IN+
V
IN-
+125mV
-125mV
t
±250mV
FS ANALOG
INPUT RANGE
0V
250mV
-250mV
Figure 10b. Differential Analog Input Signals
Table 3. Ideal Input Voltage and Output Code Results for Single-Ended Operation
0
-250mV
00000000 (zero scale)
0V
0
-250mV + 1LSB
0000001
0
0V
01111111
toggles
10000000
0V
0V
0
+250mV - 1LSB
11111111
0V
OUTPUT CODE
VIN+
OVERRANGE BIT
1
VIN-
+250mV
11111111 (full scale)
0V
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