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参数资料
| 型号： | MAX1383ATP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 1.25MSPS 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 位数： | 12 |
| 采样率（每秒）： | 1.25M |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 85.5mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极；1 个差分，单极；1 个差分，双极 |
MAX1377/MAX1379/MAX1383
Dual, 12-Bit, 1.25Msps Simultaneous-Sampling
ADCs with Serial Interface
16
______________________________________________________________________________________
the MAX1383, the signal bandwidth is limited to 100kHz
by specification. Since ±10V signals are divided down to
a 2.5V range, this version should only be used with sig-
nals greater than 5V. For those applications with signals
5V or less, use the MAX1377/MAX1379 for best SNR per-
formance. The configuration is shown on Figure 3b.
Input Bandwidth
The ADC’s input-tracking circuitry has a 5MHz small-
signal bandwidth, allowing the ADC to digitize high-
speed transient events and measure periodic signals
with bandwidths exceeding the ADC’s sampling rate by
using undersampling techniques. To avoid high-fre-
quency signals being aliased into the frequency band
of interest, anti-alias filtering is recommended.
Analog Input Protection
Internal protection diodes that clamp the analog input
to AVDD and AGND allow the analog inputs to swing
from AGND - 0.3V to AVDD + 0.3V without damage to
the MAX1377 and MAX1379. The MAX1383 can handle
±10V input swings. All inputs must not exceed the stat-
ed ranges for accurate conversions.
Internal Reference Mode
Drive REFSEL low to select internal reference mode. The
MAX1377 includes an on-chip 2.048V reference; the
MAX1379 has a 4.096V reference; and the MAX1383
includes a 2.5V internal reference. The reference output
at REF can be used as a reference voltage source for
other components. REF can source up to 2mA. Bypass
REF with a 10nF capacitor and a 4.7F capacitor to
RGND. It is important to select a low ESR capacitor and
keep the trace resistance as low as possible.
DIGIT
AL
OUTPUT
CODE
111...111
111...110
000...000
000...001
INPUT VOLTAGE (LSB)
FS
FS - 3/2 LSB
FULL-SCALE
TRANSITION
111...101
000...011
000...010
FS = VREF
ZS = 0
1 LSB =
VREF
4096
0
1
2
3
Figure 4a. MAX1377/MAX1379 Unipolar Transfer Function (U/B
= Low)
DIGIT
AL
OUTPUT
CODE
011...111
011...100
100...000
100...001
DIFFERENTIAL INPUT VOLTAGE (LSB)
+FS
VREF - 1 LSB
+FS - 3/2 LSB
FULL-SCALE
TRANSITION
000...000
111...111
111...110
+FS =
VREF
2
ZS = 0
1 LSB =
VREF
4096
-FS
000...010
000...001
111...101
-FS =
-VREF
2
MAX1377/
MAX1379
MAX1383
+FS = 4VREF
ZS = 0
-FS = -4VREF
1 LSB =
8 x VREF
4096
Figure 5. Bipolar Transfer Function (U/B = High)
T/H
3pF
R2
R4
REF (2.5V)
R1
R3
INTERNAL
SIGNAL
GROUND
INPUT
RIN ~ 11K (typ)
INA
Figure 3b. MAX1383 Equivalent Input Circuit
DIGIT
AL
OUTPUT
CODE
111...111
111...110
000...000
000...001
INPUT VOLTAGE (LSB)
FULL-SCALE
TRANSITION
111...101
000...011
000...010
MAX1383
+FS = 4VREF
-FS = -4VREF
ZS = 0
1 LSB =
8 x VREF
4096
+FS
VREF - 1 LSB
+FS - 3/2 LSB
-FS
Figure 4b. MAX1383 Single-Ended Input
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