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參數(shù)資料
| 型號： | MAX1262AEEI+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 400KSPS 28-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 400k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 9.5mW |
| 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： | 28-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-QSOP |
| 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 個偽差分，單極；4 個偽差分，雙極 |
MAX1262/MAX1264
only 50s is required after power-up. Enter standby
mode by performing a dummy conversion with the con-
trol byte specifying standby mode.
Note: Bypass capacitors larger than 4.7F between
REF and GND result in longer power-up delays.
Transfer Function
Table 6 shows the full-scale voltage ranges for unipolar
and bipolar modes.
Figure 8 depicts the nominal, unipolar input/output (I/O)
transfer function, and Figure 9 shows the bipolar I/O
transfer function. Code transitions occur halfway
between successive-integer LSB values. Output coding
is binary, with 1 LSB = (VREF / 4096).
Maximum Sampling Rate/
Achieving 475ksps
When running at the maximum clock frequency of
7.6MHz, the specified 400ksps throughput is achieved
by completing a conversion every 19 clock cycles: 1
write cycle, 3 acquisition cycles, 13 conversion cycles,
and 2 read cycles. This assumes that the results of the
last conversion are read before the next control byte is
written. It’s possible to achieve higher throughputs
(Figure 10), up to 475ksps, by first writing a control
word to begin the acquisition cycle of the next conver-
sion, then reading the results of the previous conver-
sion from the bus. This technique allows a conversion
to be completed every 16 clock cycles. Note that
switching the data bus during acquisition or conversion
can cause additional supply noise that can make it diffi-
cult to achieve true 12-bit performance.
Layout, Grounding, and Bypassing
For best performance, use PC boards. Wire-wrap config-
urations are not recommended since the layout should
ensure proper separation of analog and digital traces. Do
not run analog and digital lines parallel to each other, and
do not lay out digital signal paths underneath the ADC
package. Use separate analog and digital PC board
ground sections with only one star point (Figure 11) con-
necting the two ground systems (analog and digital). For
lowest noise operation, ensure the ground return to the
star ground’s power supply is low impedance and as
short as possible. Route digital signals far away from sen-
sitive analog and reference inputs.
400ksps, +5V, 8-/4-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
16
______________________________________________________________________________________
111 . . . 111
111 . . . 110
100 . . . 010
100 . . . 001
100 . . . 000
011 . . . 111
011 . . . 110
011 . . . 101
000 . . . 001
000 . . . 000
1
02
INPUT VOLTAGE (LSB)
OUTPUT CODE
ZS = COM
FS = REF + COM
FS
2048
(COM)
1 LSB =
REF
4096
FS - 3/2 LSB
FULL-SCALE
TRANSITION
Figure 8. Unipolar Transfer Function
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
- FS
COM*
INPUT VOLTAGE (LSB)
OUTPUT CODE
ZS = COM
+FS - 1 LSB
*COM
VREF / 2
+ COM
FS =
REF
2
-FS =
+ COM
-REF
2
1 LSB =
REF
4096
≤
Figure 9. Bipolar Transfer Function
Table 6. Full Scale and Zero Scale for Unipolar and Bipolar Operation
UNIPOLAR MODE
BIPOLAR MODE
COM
Zero scale
—
-VREF/2 + COM
Negative full scale
—
VREF + COM
VREF/2 + COM
Positive full scale
Full scale
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1262AEEI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 400ksps 5.5V 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1262AEEI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 400ksps 5.5V 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1262AEEI-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 |
| MAX1262BCEI | 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 |
| MAX1262BCEI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8Ch 400ksps 5.5V 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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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