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参数资料
| 型号： | MAX1135BCAP |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | Low-Voltage Adjustable Precision Shunt Regulator 3-SOT-89 0 to 70 |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | 5.30 MM, 0.65 MM PITCH, SSOP-20 |
| 文件页数： | 8/18页 |
| 文件大小： | 353K |
| 代理商： | MAX1135BCAP |
M
Detailed Description
The MAX1134/MAX1135 ADCs use a successive-
approximation technique and input track/hold (T/H) cir-
cuitry to convert an analog signal to a 16-bit digital
output. The MAX1134/MAX1135 easily interface to
microprocessors (μPs). The data bits can be read either
during the conversion in external clock mode or after the
conversion in internal clock mode.
In addition to a 16-bit ADC, the MAX1134/MAX1135
include an input scaler, an internal digital microcontroller,
calibration circuitry, and an internal clock generator.
The input scaler for the MAX1134 enables conversion
of input signals ranging from 0 to +6V (unipolar input)
or
±
6V (bipolar input). The MAX1135 accepts 0 to
+2.048V (unipolar input) or
±
2.048V (bipolar input). The
input range is software selectable.
Calibration
To minimize linearity, offset, and gain errors, the
MAX1134/MAX1135 have on-demand software calibra-
tion. Initiate calibration by writing a control byte with bit
M1 = 0 and bit M0 = 1 (Table 1). Select internal or exter-
nal clock for calibration by setting the INT/
EXT
bit in the
control byte. Calibrate the MAX1134/MAX1135 with the
same clock mode used for performing conversions.
Offsets resulting from synchronous noise (such as the
conversion clock) are canceled by the MAX1134/
MAX1135
’
s calibration circuitry. However, because the
magnitude of the offset produced by a synchronous
signal depends on the signal
’
s shape, recalibration
may be appropriate if the shape or relative timing of the
clock, or other digital signals change, as may occur if
more than one clock signal or frequency is used.
Input Scaler
The MAX1134/MAX1135 have an input scaler, which
allows conversion of true bipolar input voltages while
operating from a single 3.3V supply. The input scaler
attenuates and shifts the input as necessary to map the
external input range to the input range of the internal
ADC. The MAX1134 analog input range is 0 to +6V
(unipolar) or
±
6V (bipolar). The MAX1135 analog input
16-Bit ADCs, 150ksps, 3.3V Single Supply
8
_______________________________________________________________________________________
BIT
NAME
START
DESCRIPTION
7 (MSB)
The first logic 1 bit after
CS
goes low defines the beginning of the control byte.
6
UNI/
BIP
1 = unipolar, 0 = bipolar. Selects unipolar or bipolar conversion mode. In unipolar mode, analog input
signals from 0 to +6V (MAX1134) or 0 to +V
REF
(MAX1135) can be converted. In bipolar mode, analog
input signals from -6V to +6V (MAX1134) or -V
REF
to +V
REF
(MAX1135) can be converted.
5
INT/
EXT
Selects the internal or external conversion clock. 1 = internal, 0 = external.
M1
M0
0
0
0
1
1
0
1
1
Mode
24 external clocks per conversion (short acquisition mode)
Start calibration: starts internal calibration
Software power-down mode
32 external clocks per conversion (long acquisition mode)
4
M1
3
M0
2
1
P2
P1
P0
0 (LSB)
These 3 bits are stored in a port register and output to pins P2, P1, and P0 for use in addressing a mux
or PGA. These 3 bits are updated in the port register simultaneously when a new control byte is written.
Table 1. Control Byte Format
VOLTAGE
REFERENCE
BIPOLAR
UNIPOLAR
TRACK
S2
S3
S1 = BIPOLAR/UNIPOLAR
S2, S3 = T/H SWITCH
R2 = 7.6k
(MAX1134)
OR 2.5k
(MAX1135)
R3 = 3.9k
(MAX1134)
OR INFINITY (MAX1135)
HOLD
HOLD
T/H OUT
C
HOLD
32pF
R1
2.5k
R2
R3
AIN
TRACK
S1
Figure 1. Equivalent Input Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1135BEAP | 16-Bit ADCs, 150ksps, 3.3V Single Supply |
| MAX1136 | Low-Voltage Adjustable Precision Shunt Regulator 3-SOT-23 -40 to 85 |
| MAX1137 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial 10-Bit ADCs |
| MAX1138 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial 10-Bit ADCs |
| MAX1139 | 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial 10-Bit ADCs |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1135BCAP+ | 功能描述:模数转换器 - ADC 16-Bit 150ksps 3.3V Single Supply 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 |
| MAX1135BCAP+T | 功能描述:模数转换器 - ADC 16-Bit 150ksps 3.3V Single Supply 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 |
| MAX1135BCAP-T | 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 |
| MAX1135BEAP | 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 |
| MAX1135BEAP+ | 功能描述:模数转换器 - ADC 16-Bit 150ksps 3.3V Single Supply 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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