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参数资料
| 型号： | AD7939BSUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 8CH PARALL 32TQFP |
| 标准包装： | 1 |
| 位数： | 10 |
| 采样率（每秒）： | 1.5M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 13.5mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（7x7） |
| 包装： | 托盘 |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极；4 个伪差分，单极；7 伪差分，单极 |
| 配用： | EVAL-AD7939CBZ-ND - BOARD EVALUATION FOR AD7939CBZ |
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Data Sheet
AD7938/AD7939
Rev. C | Page 29 of 36
POWER vs. THROUGHPUT RATE
A considerable advantage of powering the ADC down after a
conversion is that the power consumption of the part is
significantly reduced at lower throughput rates. When using the
different power modes, the AD7938/AD7939 are only powered
up for the duration of the conversion. Therefore, the average
power consumption per cycle is significantly reduced. Figure 41
shows a plot of the power vs. throughput rate when operating in
autostandby mode for both VDD = 5 V and 3 V. For example, if
the maximum CLKIN frequency of 25.5 MHz is used to
minimize the conversion time, this accounts for only 0.525 s of
the overall cycle time while the AD7938/AD7939 remains in
standby mode for the remainder of the cycle. If the devices run
at a throughput rate of 10 kSPS, for example, the overall cycle
time is 100 s.
Figure 42 shows a plot of the power vs. throughput rate when
operating in normal mode for both VDD = 5 V and VDD = 3 V. In
both plots, the figures apply when using the internal reference.
If an external reference is used, the power-up time reduces to
600 ns; therefore, the AD7938/AD7939 remain in standby for a
greater time in every cycle. Additionally, the current consumption,
when converting, should be lower than the specified maximum
of 2.7 mA with VDD = 5 V, or 2.0 mA with VDD = 3 V.
THROUGHPUT (kSPS)
PO
W
ER
(m
W
)
1.8
0.8
1.0
1.2
1.4
1.6
0
0.6
0.4
0.2
0
20
40
60
80
100
120
140
03715-
042
TA = 25°C
VDD = 5V
VDD = 3V
Figure 41. Power vs. Throughput in
Autostandby Mode Using Internal Reference
THROUGHPUT (kSPS)
PO
W
ER
(m
W
)
10
4
5
6
7
8
9
0
3
2
1
0
200
400
600
800
1000
1200
1600
1400
03715-
043
TA = 25°C
VDD = 5V
VDD = 3V
Figure 42. Power vs. Throughput in Normal Mode Using Internal Reference
MICROPROCESSOR INTERFACING
AD7938/AD7939 to ADSP-21xx Interface
Figure 43 shows the AD7938/AD7939 interfaced to the ADSP-
21xx series of DSPs as a memory-mapped device. A single wait
state may be necessary to interface the AD7938/AD7939 to the
ADSP-21xx depending on the clock speed of the DSP. The wait
state can be programmed via the data memory wait state
control register of the ADSP-21xx (see the ADSP-21xx family
User’s Manual for details). The following instruction reads from
the AD7938/AD7939:
MR = DM (ADC)
where ADC is the address of the AD7938/AD7939.
AD7938/
AD7939*
ADSP-21xx*
WR
RD
DB0 TO DB11
D0 TO D23
A0 TO A15
DMS
IRQ2
BUSY
CS
CONVST
DSP/USER SYSTEM
WR
RD
*ADDITIONAL PINS OMITTED FOR CLARITY.
ADDRESS BUS
DATA BUS
ADDRESS
DECODER
03715-
045
Figure 43. Interfacing to the ADSP-21xx
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相关代理商/技术参数 |
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| AD7939BSUZ-REEL7 | 功能描述:IC ADC 10BIT 8CH PARALL 32TQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7940 | 制造商:AD 制造商全称:Analog Devices 功能描述:3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23 |
| AD7940BRJ | 制造商:Analog Devices 功能描述:100 KSPS, 14_BIT ADC SOT 23 PKG I.C. - Bulk |
| AD7940BRJ-R2 | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 14-bit Serial 6-Pin SOT-23 T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 100KSPS 14BIT SERL 6PIN SOT-23 - Tape and Reel |
| AD7940BRJ-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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