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參數(shù)資料
| 型號： | MAX1377ATP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 1.25MSPS DL 20-TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1.25M |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 40mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-WQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 20-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 4 個單端，單極；4 個單端，雙極；2 個差分，單極；2 個差分，雙極 |
MAX1377/MAX1379/MAX1383
Dual, 12-Bit, 1.25Msps Simultaneous-Sampling
ADCs with Serial Interface
______________________________________________________________________________________
15
Detailed Description
The MAX1377/MAX1379/MAX1383 use an input track
and hold (T/H) and SAR circuitry to convert an analog
input signal to a digital 12-bit output. The dual serial
interface requires a minimum of three digital lines
(SCLK, CNVST, and DOUT) and provides easy interfac-
ing to microprocessors (Ps) and DSPs. Four digital
lines are required for dual-output mode.
Input T/H Circuit
Upon power-up, the input T/H circuit enters its tracking
mode immediately. Following a conversion, the T/H
enters the tracking mode on the 14th SCLK rising edge
of the previous conversion (Figure 6). The T/H enters the
hold mode on the falling edge of CNVST. The time
required for the T/H to acquire an input signal is deter-
mined by how quickly the input capacitance is charged.
If the input signal’s source impedance is high, the acqui-
sition time lengthens. For the MAX1377/MAX1379, the
acquisition time, tACQ, is the minimum time needed for
the signal to be acquired (see the
Definitions section).
tACQ is calculated by the following equation:
tACQ ≥ 9 x (RS + RIN) x CIN (MAX1377/MAX1379)
where RIN = 450, CIN = 16pF, and RS is the source
impedance of the input signal.
Figure 1 shows the acquisition time as tested using the
circuit of Figure 2. The acquisition time is the time
between the rising edge of a 1V to 3V step input and
the falling edge of CONVST which produced a stable
sample. Rs represents the source impedance of the
function generator (50) and Rx represents the vari-
able filter resistance.
For the MAX1383, tACQ has a typical constant value of
125ns. Also, it has a typical constant input impedance
of 11k. Since the input voltage seen at the pin is a
function of a resistive voltage divider i.e., VIN x RIN/(RIN
+ RX) = VIN x 11k/(11k + RX), it is very important to
select an RX << 11k to avoid large gain error.
MAX1377/MAX1379 Unipolar Mode
The MAX1377/MAX1379 support two simultaneously
sampled, single-ended conversions in unipolar mode.
Drive U/B low for unipolar mode. In unipolar mode,
switches A–D in Figure 3a close according to the posi-
tion of SEL. Drive SEL low to close switches A and D
and designate AIN1A and AIN2A as the active, single-
ended inputs referenced to RGND. Drive SEL high to
close switches B and D and select AIN1B and AIN2B
as the active, single-ended inputs referenced to RGND.
The output code in unipolar mode is straight binary.
See Figure 4a for the unipolar transfer function.
MAX1377/MAX1379 Bipolar Mode
Drive U/B high to configure the inputs for bipolar/differ-
ential mode. Switches A and C in Figure 3a are closed,
designating AIN1A (AIN2A) and AIN1B (AIN2B) as the
active, differential inputs. In bipolar mode, SEL is
ignored. The output code is in two’s complement.
Figure 5 shows the transfer function for bipolar mode.
MAX1383 Input Mode
A ±10V input mode is available on the MAX1383. It is
accomplished by utilizing a resistive divider on the
input followed by a low distortion amplifier to drive the
track and hold circuit. Special high voltage ESD struc-
tures are also utilized on these channels. When using
RGND
A
B
C
D
AIN1A
(AIN2A)
AIN1B
(AIN2B)
CIN
RIN
TO ADC+
TO ADC-
CIN
RIN
Figure 3a. MAX1377/MAX1379 Equivalent Input Circuit
ADC
Rx
Rs
CONVST
C
1V TO 3V
STEP
Figure 2. Test Circuit
MAX1377
fig01
SOURCE IMPEDANCE, Rx ()
ACQUISITION
TIME
(ns)
150
100
50
200
400
600
800
1000
1200
1400
1600
1800
0
0200
C = 1nF
C = 120pF
Figure 1. MAX1377/MAX1379 Acquisition Time vs. Source
Impedance
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參數(shù)描述 |
|---|---|
| MAX1379ATP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 4Ch 1.25Msps 5.25V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1379ATP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 4Ch 1.25Msps 5.25V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1379EVKIT+ | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 MAX1379 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| MAX1383ATP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 4Ch 1.25Msps 2.5V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1383ATP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 4Ch 1.25Msps 2.5V 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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