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參數(shù)資料
| 型號(hào)： | MAX198ACAI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAS 12BIT 6CH 28-SSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS） |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 電壓電源： | 單電源 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 帶卷 (TR) |
MAX196/MAX198
Multirange, Single +5V, 12-Bit DAS
with 12-Bit Bus Interface
8
_______________________________________________________________________________________
Acquisition time is calculated as follows:
For 0V to VREF: tAZ = 9 x (RS + RIN) x 16pF
For 0V to VREF/2: tAZ = 9 x (RS + RIN) x 32pF
where RIN = 7k and tAZ is never less than 2s (0V to
VREF range) or 3s (0V to VREF/2 range).
In the external acquisition control mode (D5 = 1), the
T/H enters its tracking mode on the first WR rising edge
and enters its hold mode when it detects the second
WR rising edge with D5 = 0 (see
External Acquisition
section).
Input Bandwidth
The ADC’s input tracking circuitry has a 5MHz small-
signal bandwidth. When using the internal acquisition
mode with an external clock frequency of 2MHz, a
100ksps throughput rate can be achieved. It is possible
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-frequency signals being aliased into the fre-
quency band of interest, anti-alias filtering is recom-
mended (MAX274/MAX275 continuous-time filters).
Input Range and Protection
Figure 4 shows the equivalent input circuit. The full-
scale input voltage depends on the voltage at the refer-
ence (VREF). The MAX196 uses a scaling factor, which
allows input voltage ranges of ±10V, ±5V, 0V to +10V,
or 0V to +5V with a 4.096V voltage reference (Table 1).
Program the desired range by setting the appropriate
control bits (D3, D4) in the control byte (Tables 2 and
3). The MAX198 does not use a scaling factor, so its
input voltage range directly corresponds with the refer-
ence voltage. It can be programmed for input voltages
of ±VREF, ±VREF/2, 0V to VREF, or 0V to VREF/2 (Table
3). When an external reference is applied at REFADJ,
the voltage at REF is given by VREF = 1.6384 x VREFADJ
(2.4V < VREF < 4.18V).
The input channels are overvoltage protected to
±16.5V. This protection is active even if the device is in
power-down mode.
Even with VDD = 0V, the input resistive network provides
current-limiting that adequately protects the device.
Digital Interface
Input data (control byte) and output data are multi-
plexed on a three-state parallel interface. This parallel
I/O can easily be interfaced with a P. CS, WR, and RD
control the write and read operations. CS is the stan-
dard chip-select signal, which enables a P to address
the MAX196/MAX198 as an I/O port. When high, it dis-
ables the WR and RD inputs and forces the interface
into a high-Z state.
DGND
VDD
REF
REFADJ
INT
CH5
CH4
CH3
CH2
CH1
CH0
AGND
28
27
23
4.7
F
4.7
F
0.01
F
0.01
F
+5V
OUTPUT STATUS
22
24
21
20
19
18
17
16
1
25
P
CONTROL
INPUTS
26
2
3
4
CLK
RD
WR
CS
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
100pF
P DATA BUS
15
5
6
7
8
9
10
11
12
13
14
ANALOG
INPUTS
MAX196
MAX198
Figure 3. Operational Diagram
5.12k
R2
R1
CH_
S1
S2
S3
S4
BIPOLAR
UNIPOLAR
VOLTAGE
REFERENCE
T/H
OUT
HOLD
TRACK
HOLD
OFF
ON
CHOLD
S1 = BIPOLAR/UNIPOLAR SWITCH
S2 = INPUT MUX SWITCH
S3, S4 = T/H SWITCH
R1 = 12.5k
(MAX196) OR 5.12k (MAX198)
R2 = 8.67k
(MAX196) OR ∞ (MAX198)
Figure 4. Equivalent Input Circuit
RANGE (V) ZERO SCALE (V) -FULL SCALE +FULL SCALE
0 to +5
0
—
VREF x 1.2207
0 to +10
0
—
VREF x 2.4414
±5
—
-VREF x 1.2207 VREF x 1.2207
±10
—
-VREF x 2.4414 VREF x 2.4414
Table 1. Full Scale and Zero Scale
(MAX196 only)
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參數(shù)描述 |
|---|---|
| MAX198ACNI | 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 |
| MAX198ACNI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 100ksps 4.18V 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 |
| MAX198ACWI | 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 |
| MAX198ACWI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 100ksps 4.18V 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 |
| MAX198ACWI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 100ksps 4.18V 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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