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参数资料
| 型号： | MAX1422CCM+TD |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/15页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 20MSPS 48LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 位数： | 12 |
| 采样率（每秒）： | 20M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 152mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
Input Track-and-Hold
Transconductance Circuit
Figure 2 displays a simplified functional diagram of the
input track-and-hold (T/H) circuit in both track-and-hold
mode. In track mode, switches S1, S2a, S2b, S4a, S4b,
S5a, and S5b are closed. The fully differential circuit
samples the input signal onto the two capacitors (C2a
and C2b) through-switches (S4a and S4b). Switches S2a
and S2b set the common mode for the transconduc-
tance amplifier (OTA) input and open simultaneously
with S1, sampling the input waveform. The resulting
differential voltage is held on capacitors C2a and C2b.
Switches S4a and S4b, are then opened before switches
S3a and S3b connect capacitors C1a and C1b to the
output of the amplifier, and switch S4c is closed. The
OTA is used to charge capacitors, C1a and C1b, to the
same values originally held on C2a and C2b. This value
is then presented to the first stage quantizer and isolates
the pipeline from the fast-changing input. The wide input
bandwidth, T/H amplifier allows the MAX1422 to track
and sample/hold analog inputs of high frequencies
beyond Nyquist. The analog inputs INP and INN can be
driven either differentially or single-ended. Match the
impedance of INP and INN and set the common-mode
voltage to midsupply (AVDD/2) for optimum perfor-
mance.
Analog Input and Reference Configuration
The full-scale range of the MAX1422 is determined by the
internally generated voltage difference between REFP
(AVDD/2 + VREFIN/4) and REFN (AVDD/2 - VREFIN/4). The
MAX1422’s full-scale range is adjustable through REFIN,
which provides a high input impedance for this purpose.
REFP, CML (AVDD/2), and REFN are internally buffered,
low impedance outputs.
The MAX1422 provides three modes of reference oper-
ation:
Internal reference mode
Buffered external reference mode
Unbuffered external reference mode
In internal reference mode, the on-chip 2.048V
bandgap reference is active and REFIN, REFP, CML,
and REFN, left floating. For stability purposes bypass
REFIN, REFP, REFN, and CML with a capacitor network
of 0.22F, in parallel with a 1nF capacitor to AGND.
In buffered external reference mode, the reference volt-
age levels can be adjusted externally by applying a
stable and accurate voltage at REFIN.
In unbuffered external reference mode, REFIN is con-
nected to AGND, which deactivates the on-chip buffers
of REFP, CML, and REFN. With their buffers shut down,
MAX1422
12-Bit, 20Msps, 3.3V, Low-Power ADC with
Internal Reference
_______________________________________________________________________________________
9
T/H
VOUT
x2
Σ
FLASH
ADC
DAC
2 BITS
MDAC
12
VIN
STAGE 1
STAGE 2
D11–D0
DIGITAL CORRECTION LOGIC
STAGE 12
TO NEXT
STAGE
Figure 1. Pipelined Architecture
S3b
S3a
CML
S5b
S2b
S5a
IN+
IN-
S1
OUT
C2a
C2b
S4c
S4a
S4b
C1b
C1a
INTERNAL
BIAS
OTA
INTERNAL
BIAS
CML
S2a
Figure 2. Internal T/H Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1422ECM | 制造商:Maxim Integrated Products 功能描述:48 PINS TQFP PKG - Bulk |
| MAX1422ECM+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 |
| MAX1422ECM+TD | 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 |
| MAX1422ECM-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 |
| MAX1422ECM-TD | 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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