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參數(shù)資料
| 型號： | MAX1148BEUP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 4CH 116KSPS 20TSSOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 74 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 116k |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 879mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 20-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 8 個單端，單極；8 個單端，雙極；4 個差分，單極；4 個差分，雙極 |
| 產品目錄頁面： | 1395 (CN2011-ZH PDF) |
MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
______________________________________________________________________________________
19
Method 1 allows the direct application of an external
reference from 1.5V to VDD + 50mV. The REF input
impedance is typically 10k
. During conversion, an
external reference at REF must deliver up to 210A and
have an output impedance less than 10
. Bypass REF
with a 0.1F capacitor to AGND to improve its output
impedance.
Method 2 utilizes the internal reference buffer to reduce
the external reference load. The REFADJ input imped-
ance is typically 20k
. During a conversion, an external
reference at REFADJ must deliver at least 100A and
have an output impedance less than 100
. The
MAX1146/MAX1148 reference buffer has a 3.277V/V
gain and the MAX1147/MAX1149 has a gain of
2.000V/V. The external reference voltage at REFADJ
multiplied by the reference buffer gain is the SAR ADC
reference voltage. This reference appears at REF and
must be from 1.5V to VDD + 50mV. Bypass REFADJ
with a 0.01F capacitor and bypass REF with a 2.2F
capacitor to AGND.
Transfer Function
Table 7 shows the full-scale voltage ranges for unipolar
and bipolar modes.
Output data coding for the MAX1146–MAX1149 is bina-
ry in unipolar mode and two’s complement binary in
bipolar mode with 1 LSB = (VREF/2N), where N is the
number of bits (14). Code transitions occur halfway
between successive-integer LSB values. Figure 14 and
Figure 15 show the input/output (I/O) transfer functions
for unipolar and bipolar operations, respectively.
Serial Interfaces
The MAX1146–MAX1149 feature a serial interface that
is fully compatible with SPI, QSPI, and MICROWIRE. If a
serial interface is available, establish the CPU’s serial
interface as a master, so that the CPU generates the
serial clock for the ADCs. Select a clock frequency up
to 2.1MHz.
SPI and MICROWIRE Interface
When using an SPI (Figure 16a) or MICROWIRE interface
(Figure 16b), set CPOL = CPHA = 0. Two 8-bit readings
are necessary to obtain the entire 14-bit result from the
ADC. DOUT data transitions on the serial clock’s falling
MAX1146–
MAX1149
MAX6163
1.250V
BANDGAP
REFERENCE
20k
SAR
ADC
REF
REFERENCE
BUFFER
DISABLED
DGND
VDD
0.1
F
0.1
F
+5V
OUT
IN
GND
+5V
3.000V
AGND
REFADJ
REF
Figure 12. External Reference Applied to REF
MAX1146–
MAX1149
0.047
F
510k
24k
100k
+3.3V
REFADJ
Figure 13. Reference Adjust Circuit
UNIPOLAR MODE
BIPOLAR MODE
INPUT AND OUTPUT
MODES
ZERO SCALE
FULL SCALE
NEGATIVE FULL
SCALE
ZERO SCALE
POSITIVE FULL
SCALE
Single-Ended Mode
VCOM
VREF + VCOM
VCOM
Differential Mode
VIN-
VREF + VIN-
VIN-
Table 7. Full Scale and Zero Scale
Note: The common mode range for the analog inputs is from AGND to VDD.
+
V
REF
COM
2
+
V
REF
IN
2
+
V
REF
COM
2
+
V
REF
IN
2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1148BEUP+ | 功能描述:模數(shù)轉換器 - ADC 14-Bit 8Ch 116ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148BEUP+T | 功能描述:模數(shù)轉換器 - ADC 14-Bit 8Ch 116ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148BEUP-T | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148CGP | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL, TRUE-DIFFERENTIAL, SERIAL, 14-B - Rail/Tube |
| MAX1148CUP | 制造商:Maxim Integrated Products 功能描述:MULTICHANNEL, TRUE-DIFFERENTIAL, SERIAL, 14-B - Rail/Tube |
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