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參數(shù)資料
| 型號(hào)： | SPT7866SCR |
| 廠商： | SIGNAL PROCESSING TECHNOLOGIES |
| 元件分類： | ADC |
| 英文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 64K |
| 代理商： | SPT7866SCR |
SPT
5
11/20/01
SPT7866
Figure 1 – Typical Interface Circuit
TYPICAL INTERFACE CIRCUIT
REFERENCES
The SPT7866 has a differential analog input. The input
range is determined by the voltages VIN and VIN applied to
reference pins REFH and REFL respectively, and is equal
to ±(VIN–VIN). Externally generated reference voltages
connected to REFH and REFL should be symmetric
around 2.5 V. The input range can be defined between
±0.6 V and ±1.5 V. An internal reference exists, providing
reference voltages at pins REFH and REFL equal to +3.0 V
(VREFH) and +2.0 V (VREFL). These can be connected to
REFH and REFL by connecting pin EXT/INT to GND. The
references should be bypassed as close to the converter
pins as possible using 100 nF capacitors in parallel with
smaller capacitors (e.g. 220 pF) to ground.
ANALOG INPUT
The input of the SPT7866 can be configured in various
ways, dependent upon whether a single-ended or differen-
tial, AC- or DC-coupled input is wanted.
AC-coupled input is most conveniently implemented using
a transformer with a center-tapped secondary winding.
The center tap is connected to the VCM node, as shown in
figure 1. In order to obtain low distortion, it is important that
the selected transformer does not exhibit core saturation
at full scale. Excellent results are obtained with the Mini-
Circuits T1-6T or T1-1T. Proper termination of the input is
important for input signal purity. A small capacitor (typically
68 pF) across the inputs attenuates kickback noise from
the sample-and-hold. A small capacitor (1 nF) between
VCM and ground has also been proven to be advanta-
geous.
If a DC-coupled, single-ended input is wanted, a solution
based on operational amplifiers, as shown in figure 2, is
usually preferred. The AD8138 is suggested for low distor-
tion and video bandwidth. Lower cost operational amplifi-
ers may be used if the demands are less strict.
Figure 2 – DC-Coupled, Single-Ended to Differential
Conversion (power supplies and bypassing
not shown)
Analog
In
Input
Offset
51 W
AD8138
470 W
100 W
51 W
100 W
15 pF
ADC
VIN
51 W
470 W
AD8138
AIN
Mini-Circuits
T16T or
T11T
RT1
50 W
OR
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
(MSB)
(LSB)
VIN
VCM
Sleep
0.1
10
+
VIN
EXT/INT
T1
Ext
+A5
0.1
10
+
0.1
10
+
REFL
REFH
Mini-Circuits
T16T
or
T11T
RT2
50 W
10
+
T2
0.1
+A5
1 kW
CLKIN
50 W
CLK
+A5
AGND
V
DD
0.1
10
+
+A3/5
AGND
OV
DD
0.1
10
+
OGND
GND
DGND
+D3/5
Buffer
Ferrite Bead
SPT7866
Logic
Interface
Circuit
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| SPT7866SIR | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
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| SPT7868 | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| SPT7870SIQ | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP44 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPT7868 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10-BIT,80 MSPS A/D CONVERTER |
| SPT7868SIR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10-BIT,80 MSPS A/D CONVERTER |
| SPT7870 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10-BIT, 100 MSPS ECL A/D CONVERTER |
| SPT7870SCU | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10-BIT, 100 MSPS ECL A/D CONVERTER |
| SPT7870SIQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10-BIT, 100 MSPS ECL A/D CONVERTER |
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