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參數(shù)資料
| 型號： | MX7828KP+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 8BIT HS 28-PLCC |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 500 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 400k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 3 |
| 功率耗散（最大）： | 75mW |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 8 個單端，單極 |
MX7824/MX7828
CMOS, High-Speed, 8-Bit ADCs
with Multiplexer
6
_______________________________________________________________________________________
_______________Detailed Description
Converter Operation
The MAX154/MAX158 and MX7824/MX7828 use what is
commonly called a “half-flash” conversion technique
(Figure 3). Two 4-bit flash ADC sections are used to
achieve an 8-bit result. Using 15 comparators, the
upper 4-bit MS (most significant) flash ADC compares
the unknown input voltage to the reference ladder and
provides the upper four data bits.
An internal DAC uses the MS bits to generate an analog
signal from the first flash conversion. A residue voltage
representing the difference between the unknown input
and the DAC voltage is then compared to the reference
ladder by 15 LS (least significant) flash comparators to
obtain the lower four output bits.
Operating Sequence
The operating sequence is shown in Figure 4. A con-
version is initiated by a falling edge of RD and CS. The
comparator inputs track the analog input voltage for
approximately 1s. After this first cycle, the MS flash
result is latched into the output buffers and the LS con-
version begins. INT goes low approximately 600ns
later, indicating the end of the conversion, and that the
lower four bits are latched into the output buffers. The
data can then be accessed using the CS and RD
inputs.
___________________Digital Interface
The MAX154/MAX158 and MX7824/MX7828 use only
Chip Select (CS) and Read (RD) as control inputs. A
READ operation, taking CS and RD low, latches the mul-
tiplexer address inputs and starts a conversion (Table 1).
There are two interface modes, which are determined
by the length of the RD input. Mode 0, implemented by
keeping RD low until the conversion ends, is designed
for microprocessors that can be forced into a WAIT
state. In this mode, a conversion is started with a READ
operation (taking CS and RD low), and data is read
when the conversion ends. Mode 1, on the other hand,
4-BIT
DAC
THREE-
STATE
DRIVERS
ADDRESS
LATCH
DECODE
4-BIT
FLASH
ADC
(4LSB)
4-BIT
FLASH
ADC
(4MSB)
2.5V
REF
TIMING AND CONTROL
CIRCUITRY
MUX*
VREF+
16
A0
*MAX154/MX7824 – 4-Channel Mux
MAX158/MX7828 – 8-Channel Mux
** REF OUT on MAX154/MAX158 only
A1
A2
RDY
CS
RD
AIN1
AIN4
AIN8
REF OUT**
VREF-
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
INT
MAX154/MX7824
A1
A0
MAX158/MX7828
A2
A1
A0
SELECTED
CHANNEL
00
01
10
11
00
0
00
1
01
0
01
1
AIN1
AIN2
AIN3
AIN4
Figure 3. Functional Diagram
Table 1. Truth Table for Input Channel
Selection
10
0
10
1
11
0
11
1
AIN5
AIN6
AIN7
AIN8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MX7828LCAI | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:CMOS, High-Speed, 8-Bit ADCs with Multiplexer |
| MX7828LCWI | 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MX7828LCWI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 8Ch 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 |
| MX7828LCWI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 8Ch 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 |
| MX7828LCWI-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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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