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參數(shù)資料
| 型號(hào)： | MAX1144BCAP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 150KSPS 20-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 150k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 26.4mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個(gè)單端，單極；1 個(gè)單端，雙極 |
MAX1144/MAX1145
Detailed Description
The MAX1144/MAX1145 ADCs use a successive-
approximation technique and input track/hold (T/H) cir-
cuitry to convert an analog signal to a 14-bit digital
output. The MAX1144/MAX1145 easily interface to
microprocessors (Ps). 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 14-bit ADC, the MAX1144/MAX1145
include an input scaler, an internal digital microcontroller,
calibration circuitry, and an internal clock generator.
The input scaler for the MAX1144 enables conversion
of input signals ranging from 0 to +6V (unipolar input)
or
±6V (bipolar input). The MAX1145 accepts 0 to
+2.048V (unipolar input) or
±2.048V (bipolar input).
Input range is software selectable.
Calibration
To minimize linearity, offset, and gain errors, the
MAX1144/MAX1145 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 MAX1144/MAX1145 with the
same clock mode used for performing conversions.
Offsets resulting from synchronous noise (such as the
conversion clock) are canceled by the MAX1144/
MAX1145’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 MAX1144/MAX1145 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 MAX1144 analog input range is 0 to +6V
(unipolar) or
±6V (bipolar). The MAX1145 analog input
14-Bit ADCs, 150ksps, 3.3V Single Supply
8
_______________________________________________________________________________________
BIT
NAME
DESCRIPTION
7 (MSB)
START
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 (MAX1144) or 0 to +VREF (MAX1145) can be converted. In bipolar mode, analog
input signals from –6V to +6V (MAX1144) or –VREF to +VREF (MAX1145) can be converted.
5
INT/
EXT
Selects the internal or external conversion clock. 1 = internal, 0 = external.
M1
M0
Mode
0
24 external clocks per conversion (short acquisition mode)
4M1
0
1
Start calibration: starts internal calibration
1
0
Software power-down mode
3M0
1
32 external clocks per conversion (long acquisition mode)
2P2
1P1
0 (LSB)
P0
These three bits are stored in a port register and output to pins P2, P1, P0 for use in addressing a mux
or PGA. These three bits are updated in the port register simultaneously when a new control byte is
written.
Table 1. Control Byte Format
Figure 1. Equivalent Input Circuit
VOLTAGE
REFERENCE
BIPOLAR
UNIPOLAR
TRACK
S2
S3
S1 = BIPOLAR/UNIPOLAR
S2, S3 = T/H SWITCH
R2 = 7.6k
(MAX1144)
OR 2.5k
(MAX1145)
R3 = 3.9k
(MAX1144)
OR INFINITY (MAX1145)
HOLD
T/H OUT
CHOLD
32pF
R1
2.5k
R2
R3
AIN
TRACK
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1144BCAP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 150ksps 2.2V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BCAP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 150ksps 2.2V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BCAP-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BEAP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1144BEAP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 150ksps 2.2V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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