Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

AD7880BN Datasheet(PDF) 5 Page - Analog Devices

Part # AD7880BN
Description  LC2MOS Single 5 V Supply, Low Power, 12-Bit Sampling ADC
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7880BN Datasheet(HTML) 5 Page - Analog Devices

  AD7880BN Datasheet HTML 1Page - Analog Devices AD7880BN Datasheet HTML 2Page - Analog Devices AD7880BN Datasheet HTML 3Page - Analog Devices AD7880BN Datasheet HTML 4Page - Analog Devices AD7880BN Datasheet HTML 5Page - Analog Devices AD7880BN Datasheet HTML 6Page - Analog Devices AD7880BN Datasheet HTML 7Page - Analog Devices AD7880BN Datasheet HTML 8Page - Analog Devices AD7880BN Datasheet HTML 9Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 16 page
background image
AD7880
REV. 0
–5–
+
R
V
INA
V
INB
R
V
DAC
Figure 4. AD7880 Input Circuit
The AD7880 accommodates three separate input ranges, 0 to
VREF, 0 to 2 VREF and
±V
REF. The input configurations corre-
sponding to these ranges are shown in Figures 5, 6 and 7.
With VREF = VDD and using a nominal VDD of +5 V, the input
ranges are 0 V to 5 V, 0 V to 10 V and +5 V, as shown in
Table II.
Table II. Analog Input Ranges
Analog Input
Input Connections
Connection
Range
VREF
VINA
VINB
Diagram
0 V to +5 V
VDD
VIN
VIN
Figure 5
0 V to +10 V
VDD
VIN
AGND
Figure 6
±5 V
VDD
VIN
VREF
Figure 7
+
R
R
SAMPLING
COMPARATOR
V
INA
V
INB
V
REF
AGND
12-BIT DAC
0 TO V
REF
V
REF
= 0 TO V
REF
V
IN
Figure 5. 0 to VREF Unipolar Input Configuration
+
R
R
SAMPLING
COMPARATOR
V
INA
V
INB
V
REF
AGND
12-BIT DAC
0 TO V
REF
V
REF
= 0 TO 2V
REF
V
IN
Figure 6. 0 to 2 VREF Unipolar Input Configuration
+
R
R
SAMPLING
COMPARATOR
V
INA
V
INB
V
REF
AGND
12-BIT DAC
0 TO V
REF
V
REF
= V
REF
V
IN
±
Figure 7.
±V
REF Bipolar Input Configuration
CIRCUIT INFORMATION
The AD7880 is a +5 V single supply 12-bit A/D converter. The
part requires no external components apart from a 2.5 MHz ex-
ternal clock and power supply decoupling capacitors. It contains
a 12-bit successive approximation ADC based on a fast-settling
voltage-output DAC, a high speed comparator and SAR, as well
as the necessary control logic. The charge balancing comparator
used in the AD7880 provides the user with an inherent track-
and-hold function. The ADC is specified to work with sampling
rates up to 66 kHz.
CONVERTER DETAILS
The AD7880 conversion cycle is initiated on the rising edge of
the CONVST pulse, as shown in the timing diagram of Figure
1. The rising edge of the CONVST pulse places the track/hold
amplifier into “HOLD” mode. The conversion cycle then takes
between 26 and 28 clock periods. The maximum specified con-
version time is 12
µs. This corresponds to a conversion cycle
time of 28 clock periods with a CLKIN frequency of 2.5 MHz
and also includes internal propagation delays. During conver-
sion the BUSY output will remain low, and the output databus
drivers will be three-stated. When a conversion is completed,
the BUSY output will go to a high level, and the result of the
conversion can be read by bringing CS and RD low.
The track/hold amplifier acquires a 12-bit input signal in 3
µs.
The overall throughput time for the AD7880 is equal to the
conversion time plus the track/hold acquisition time. For a
2.5 MHz input clock the throughput time is 15
µs.
REFERENCE INPUT
For specified performance, it is recommended that the reference
input be tied to VDD. The part, however, will operate with a ref-
erence down to 2.5 V though with reduced performance specifi-
cations. Figure 3 shows a graph of signal-to-noise ratio (SNR)
versus VREF.
VREF must not be allowed to go above VDD by more than
100 mV.
74
72
70
68
66
64
62
60
234
5
V
REF – Volts
F = 51.2kHz
S
F = 2.525kHz
IN
T = 25 C
A
Figure 3. SNR vs. VREF
ANALOG INPUT
The AD7880 has two analog input pins, VINA and VINB. Figure
4 shows the input circuitry to the ADC sampling comparator.
The on-board attenuator network, made up of equal resistors,
allows for various input ranges.


Similar Part No. - AD7880BN

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD7880BN AD-AD7880BN Datasheet
337Kb / 16P
   LC2MOS Single 5 V Supply, Low Power, 12-Bit Sampling ADC
REV. 0
AD7880BN AD-AD7880BN Datasheet
340Kb / 16P
   LC2MOS Single 5 V Supply, Low Power, 12-Bit Sampling ADC
REV. 0
More results

Similar Description - AD7880BN

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD7880 AD-AD7880 Datasheet
337Kb / 16P
   LC2MOS Single 5 V Supply, Low Power, 12-Bit Sampling ADC
REV. 0
AD7880BRZ AD-AD7880BRZ Datasheet
340Kb / 16P
   LC2MOS Single 5 V Supply, Low Power, 12-Bit Sampling ADC
REV. 0
AD7880 AD-AD7880_15 Datasheet
340Kb / 16P
   LC MOS Single 5 V Supply, Low Power, 12-Bit Sampling ADC
REV. 0
AD7883 AD-AD7883 Datasheet
349Kb / 12P
   LC2MOS 12-Bit, 3.3 V Sampling ADC
REV. 0
AD7892BNZ-1 AD-AD7892BNZ-1 Datasheet
146Kb / 14P
   LC2MOS Single Supply, 12-Bit 600 kSPS ADC
REV. C
AD7892 AD-AD7892_17 Datasheet
178Kb / 15P
   LC2MOS Single Supply, 12-Bit 600 kSPS ADC
AD7892 AD-AD7892 Datasheet
144Kb / 14P
   LC2MOS Single Supply, 12-Bit 600 kSPS ADC
REV. C
AD7892BRZ-1 AD-AD7892BRZ-1 Datasheet
135Kb / 14P
   LC2MOS Single Supply, 12-Bit 600 kSPS ADC
REV. C
AD7870A AD-AD7870A Datasheet
250Kb / 12P
   LC2MOS Complete, 12-Bit, 100 kHz , Sampling ADC
REV. 0
AD7858ARZ AD-AD7858ARZ Datasheet
306Kb / 32P
   3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC
REV. B
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com