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参数资料
| 型号： | SPT7935 |
| 厂商： | Fairchild Semiconductor Corporation |
| 英文描述： | 12-BIT, 20 MSPS, 79 mW A/D CONVERTER |
| 中文描述： | 12位，20 MSPS的79毫瓦的A / D转换器 |
| 文件页数： | 5/8页 |
| 文件大小： | 54K |
| 代理商： | SPT7935 |
5
7/12/00
SPT7935
Figure 1 – Timing Diagram
N+8
N+7
N+6
N+2
N+1
N
N-1
t
D
N-2
N-1
N
Sampling Points
t
AP
A
IN
CLK
D
OUT
GENERAL DESCRIPTION
The SPT7935 is an ultra-low power, 12-bit, 20 MSPS ADC.
It has a pipelined architecture and incorporates digital error
correction of the 11 most significant bits. This error correction
ensures good linearity performance for input frequencies up
to Nyquist. The inputs are fully differential, making the device
insensitive to system-level noise. This device can also be
used in a single-ended mode. (See analog input section.)
With the power dissipation roughly proportional to the sam-
pling rate, this device is ideal for very low power applications
in the range of 1 to 20 MSPS.
TYPICAL INTERFACE CIRCUIT
The SPT7935 requires few external components to achieve
the stated operation and performance. Figure 2 shows the
typical interface requirements when using the SPT7935 in
normal circuit operation. The following sections provide
a description of the functions and outline critical perform-
ance criteria to consider for achieving the optimal device
performance.
ANALOG INPUT
The input of the SPT7935 can be configured in various ways
depending on if a single-ended or differential, AC- or DC-
coupled input is desired.
Figure 2 – Typical Interface Circuit
GND
.01
μ
F
+
4.7
μ
F
Ref– In
(+1.15 V)
Ref+ In
(+2.15 V)
.01
μ
F
+
10
μ
F
0.1
μ
F
+3.3 V
CLK In
(3 V Logic)
Interfacing
3 V Logic
Decoupling Cap
+3.3 V
DGND
FB
(MSB)
AGND
U1
SPT7935
.01
μ
F
(+1.65 V)
Minicircuit
T1-6T
RF In
51
68 pF
22
23
11
12
34
33
1
44(LSB)
N/C
N/C
N/C
GND
Bias1
Bias2
V
CM
GND
V
IN
+
V
IN
–
GND
D
D
V
DD3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
G
C
N
V
D
V
D
V
D
V
D
V
D
V
D
V
R
–
V
R
+
.01
μ
F
+
4.7
μ
F
+3.3 V Digital
9.5
μ
A
90
μ
A
Notes: All V
DD1
, V
DD2
and V
DD3
should be tied together.
FB = Ferrite Bead; must be placed as close to U1 as possible.
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| SPT7935SIT | 12-BIT, 20 MSPS, 79 mW A/D CONVERTER |
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| SPT7936SCT | 12-BIT, 28 MSPS SAMPLING A/D CONVERTER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SPT7935SCT | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| SPT7935SCT_D | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| SPT7935SCTX | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| SPT7935SIT | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| SPT7935SITX | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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