- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10143 > AD670JPZ (Analog Devices Inc)IC ADC 8BIT SIGNAL COND 20-PLCC PDF資料下載
參數(shù)資料
| 型號： | AD670JPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT SIGNAL COND 20-PLCC |
| 標準包裝： | 1 |
| 位數(shù)： | 8 |
| 采樣率（每秒）： | 10k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 450mW |
| 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： | 20-LCC（J 形引線） |
| 供應商設(shè)備封裝： | 20-PLCC（9x9） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個差分，單極；1 個差分，雙極 |
AD670
REV. A
–6–
Table I. AD670 Input Selection/Output Format Truth Table
INPUT RANGE/
BPO/UPO
FORMAT
OUTPUT FORMAT
0
Unipolar/Straight Binary
1
0
Bipolar/Offset Binary
0
1
Unipolar/2s Complement
1
Bipolar/2s Complement
DIFF
STRAIGHT BINARY
+VIN
–VIN
VIN
(FORMAT = 0, BPO/UPO = 0)
0
0000 0000
128 mV
0
128 mV
1000 0000
255 mV
0
255 mV
1111 1111
255 mV
0
0000 0000
128 mV
127 mV
1 mV
0000 0001
128 mV
–127 mV
255 mV
1111 1111
Figure 5a. Unipolar Output Codes (Low Range)
OFFSET BINARY 2s COMPLEMENT
DIFF
(FORMAT = 0,
(FORMAT = 1,
+VIN
–VIN
VIN
BPO/UPO = 1)
0
1000 0000
0000 0000
127 mV
0
127 mV
1111 1111
0111 1111
1.127 V
1.000 V
127 mV
1111 1111
0111 1111
255 mV
0
1000 0000
0000 0000
128 mV
127 mV
1 mV
1000 0001
0000 0001
127 mV
128 mV
–1 mV
0111 1111
1111 1111
127 mV
255 mV
–128 mV
0000 0000
1000 0000
–128 mV 0
–128 mV
0000 0000
1000 0000
Figure 5b. Bipolar Output Codes (Low Range)
Calibration
Because of its precise factory calibration, the AD670 is intended
to be operated without user trims for gun and offset; therefore,
no provisions have been made for such user trims. Figures 6a,
6b, and 6c show the transfer curves at zero and full scale for the
unipolar and bipolar modes. The code transitions are positioned
so that the desired value is centered at that code. The first LSB
transition for the unipolar mode occurs for an input of +1/2 LSB
(5 mV or 0.5 mV). Similarly, the MSB transition for the bipolar
mode is set at –1/2 LSB (–5 mV or –0.5 mV). The full scale
transition is located at the full scale value –1 1/2 LSB. These
values are 2.545 V and 254.5 mV.
6a. Unipolar Transfer Curve
Figure 4a. CMRR Over Frequency
Figure 4b. AD670 Input Rejects Common-Mode
Ground Noise
Good common-mode performance is useful in a number of situ-
ations. In bridge-type transducer applications, such performance
facilitates the recovery of differential analog signals in the pres-
ence of a dc common-mode or a noisy electrical environment.
High frequency CMRR also becomes important when the ana-
log signal is referred to a noisy, remote digital ground. In each
case, the CMRR specification of the AD670 allows the integrity
of the input signal to be preserved.
The AD670’s common-mode voltage tolerance allows great
flexibility in circuit layout. Most other A/D converters require
the establishment of one point as the analog reference point.
This is necessary in order to minimize the effects of parasitic
voltages. The AD670, however, eliminates the need to make the
analog ground reference point and A/D analog ground one and
the same. Instead, a system such as that shown in Figure 4b is
possible as a result of the AD670’s common-mode performance.
The resistors and inductors in the ground return represent un-
avoidable system parasitic impedances.
Input/Output Options
Data output coding (2s complement vs. straight binary) is
selected using Pin 12, the FORMAT pin. The selection of
input format (bipolar vs. unipolar) is controlled using Pin 11,
BPO/UPO. Prior to a write/convert, the state of FORMAT and
BPO/UPO should be available to the converter. These lines may
be tied to the data bus and may be changed with each conver-
sion if desired. The configurations are shown in Table I. Output
coding for representative signals in each of these configurations
is shown in Figure 5.
An output signal, STATUS, indicates the status of the conver-
sion. STATUS goes high at the beginning of the conversion and
returns low when the conversion cycle has been completed.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VI-224-IW-F1 | CONVERTER MOD DC/DC 48V 100W |
| AD7778ASZ | IC ADC 10BIT 8CHAN HS 44-MQFP |
| VI-223-IW-F4 | CONVERTER MOD DC/DC 24V 100W |
| LTC2247IUH#TRPBF | IC ADC 14BIT 40MSPS SAMPL 32-QFN |
| VI-223-IW-F2 | CONVERTER MOD DC/DC 24V 100W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD670JPZ-REEL7 | 功能描述:IC ADC 8BIT SIGNAL COND 20-PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 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:24-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD670KN | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 20-Pin PDIP N 制造商:Rochester Electronics LLC 功能描述:IC - 8-BIT A/D CONVERTER - Bulk |
| AD670KNZ | 功能描述:IC ADC 8BIT SGNL COND 20DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD670KP | 制造商:Analog Devices 功能描述:ADC Single SAR 8-bit Parallel 20-Pin PLCC |
| AD670KPZ | 功能描述:IC ADC 8BIT SIGNAL COND 20-PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
發(fā)布緊急采購，3分鐘左右您將得到回復。