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PDF AD7828 Data sheet ( Hoja de datos )
| Número de pieza | AD7828 | |
| Descripción | LC2MOS High Speed 4- & 8-Channel 8-Bit ADCs | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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LC2MOS High Speed
4- & 8-Channel 8-Bit ADCs
AD7824/AD7828
FEATURES
4- or 8-Analog Input Channels
Built-In Track/Hold Function
10 kHz Signal Handling on Each Channel
Fast Microprocessor Interface
Single 5 V Supply
Low Power: 50 mW
Fast Conversion Rate, 2.5 s/Channel
Tight Error Specification: 1/2 LSB
FUNCTIONAL BLOCK DIAGRAM
VREF (+)
VREF (–)
AIN 1
4-BIT
FLASH
ADC
(4MSB)
DB7
DB6
DB5
DB4
AIN 4 MUX*
AIN 8
VREF (+)
16
4-BIT
DAC
4-BIT
FLASH
ADC
(4LSB)
THREE
STATE
DRIVERS
ADDRESS
LATCH
DECODE
A0 A1 A2**
*AD7824 – 4-CHANNEL MUX
**AD7828 – 8-CHANNEL MUX
A2 – AD7828 ONLY
TIMING AND CONTROL
CIRCUITRY
RDY
CS
RD
DB3
DB2
DB1
DB0
INT
GENERAL DESCRIPTION
The AD7824 and AD7828 are high-speed, multichannel, 8-bit
ADCs with a choice of 4 (AD7824) or 8 (AD7828) multiplexed
analog inputs. A half-flash conversion technique gives a fast
conversion rate of 2.5 µs per channel and the parts have a built-
in track/hold function capable of digitizing full-scale signals of
10 kHz (157 mV/µs slew rate) on all channels. The AD7824 and
AD7828 operate from a single 5 V supply and have an analog
input range of 0 V to 5 V, using an external 5 V reference.
Microprocessor interfacing of the parts is simple, using standard
Chip Select (CS) and Read (RD) signals to initiate the conver-
sion and read the data from the three-state data outputs. The
half-flash conversion technique means that there is no need to
generate a clock signal for the ADC. The AD7824 and AD7828
can be interfaced easily to most popular microprocessors.
The AD7824 and AD7828 are fabricated in an advanced, all
ion-implanted, linear-compatible CMOS process (LC2MOS)
and have low power dissipation of 40 mW (typ). The AD7824
is available in a 0.3" wide, 24-lead “skinny” DIP, while the
AD7828 is available in a 0.6" wide, 28-lead DIP and in 28-
terminal surface mount packages.
PRODUCT HIGHLIGHTS
1. 4- or 8-channel input multiplexer gives cost-effective space-
saving multichannel ADC system.
2. Fast conversion rate of 2.5 µs/channel features a per channel
sampling frequency of 100 kHz for the AD7824 or 50 kHz
for the AD7828.
3. Built-in track-hold function allows handling of 4- or 8-
channels up to 10 kHz bandwidth (157 mV/µs slew rate).
4. Tight total unadjusted error spec and channel-to-channel
matching eliminate the need for user trims.
5. Single 5 V supply simplifies system power requirements.
6. Fast, easy-to-use digital interface allows connection to most
popular microprocessors with minimal external components.
No clock signal is required for the ADC.
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
1 page  
Typical Performance Characteristics–AD7824/AD7828
TPC 1. Conversion Time vs. Temperature
TPC 4. Power Supply Current vs. Temperature
(Not Including Reference Ladder)
TPC 2. Accuracy vs. VREF [VREF = VREF(+) – VREF(–)]
TPC 5. Accuracy vs. tP
TPC 3. Signal-Noise Ratio vs. Input Frequency
TPC 6. Output Current vs. Temperature
REV. D
–5–
5 Page 
SPEECH
INPUT
AMP
BANDPASS
FILTER 1
BANDPASS
FILTER 2
BANDPASS
FILTER 7
BANDPASS
FILTER 8
+5V
+5V
AIN 1 VDD
AIN 2
CS
RD
DB7
AD7828
DATA
AIN 7
DB0
A2
AIN 8
A1
VREF (+)
A0
VREF(–) GND
Figure 19. Speech Analysis Using Real-Time Filtering
AD7824/AD7828
+5V
VDD CS RD
AIN 1
INT
AIN 2
AIN 3
DB7
AIN 4
DB0
AD7824
VREF (+)
A1
VREF (–)
A0
GND
SAMPLE
PULSE
+15V
WR VDD VREF
AD7226
DB7
VOUT A
DB0
VOUT B
VOUT C
A1 VOUT D
A0 DGND
VSS AGND
+10V
VO1
VO 2
VO 3
VO 4
Figure 20. 4-Channel Fast Infinite Sample-and-Hold
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
24-Lead Plastic DIP (N-24)
1.228 (31.19)
1.226 (31.14)
24
1
PIN 1
13 0.260 ؎ 0.001
12 (6.61 ؎ 0.03)
0.32 (8.128)
0.30 (7.62)
0.130 (3.30)
0.128 (3.25)
0.07 (1.78) 0.02 (0.5)
0.05 (1.27) 0.016 (0.41)
SEATING
PLANE
0.11 (2.79)
0.09 (2.28)
0.011 (0.28)
15؇ 0.009 (0.23)
0
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
PLASTIC LEADS WILL BE EITHER SOLDER DIPPED OR TIN/LEAD PLATED
IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS
24-Lead Small Outline Package (R-24)
0.6141 (15.60)
0.5985 (15.20)
24 13
0.2992 (7.60)
0.2914 (7.40)
0.4193 (10.65)
1 12 0.3937 (10.00)
PIN 1
0.1043 (2.65)
0.0926 (2.35)
0.0291 (0.74)
0.0098 (0.25)؋ 45؇
0.0118 (0.30) 0.0500
0.0040 (0.10)
(1.27)
BSC
8؇
0.0192 (0.49)
0.0138 (0.35)
SEATING
PLANE
0.0125 (0.32)
0؇
0.0091 (0.23)
0.0500 (1.27)
0.0157 (0.40)
24-Lead Cerdip (Q-24)1
1.290 (32.77) MAX
24
PIN 1
1
13 0.295
(7.493)
12 MAX
0.320 (8.128)
0.290 (7.366)
0.070 (1.778)
0.225
(5.715)
0.020 (0.508)
MAX
SEATING
PLANE
0.125
(3.175)
MIN
0.021 (0.533) 0.110 (2.794) 0.065 (1.651)
0.015 (0.381) 0.090 (2.286) 0.055 (1.397)
15°
0°
TYP TYP
0.180
(4.572)
MAX
0.012 (0.305)
0.008 (0.203)
TYP
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
CERDIP LEADS WILL BE EITHER TIN/LEAD PLATED OR SOLDER DIPPED
IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS
28-Lead Plastic DIP (N-28)
1.45 (36.83)
1.44 (36.58)
28 15
0.55 (13.97)
0.53 (13.47)
1 14
PIN 1
0.16 (4.07)
0.15 (3.56)
0.606 (15.4)
0.594 (15.09)
0.2
(5.08)
MAX
0.175 (4.45)
0.12 (3.05)
0.065 (1.66)
0.02 (0.508)
SEATING
0.105 (2.67) PLANE
0.045 (1.15) 0.015 (0.381) 0.095 (2.42)
15؇
0؇
0.012 (0.305)
0.008 (0.203)
LEAD NO. 1 IDENTIFIED BY DOT OR NOTCH
PLASTIC LEADS WILL BE EITHER SOLDER DIPPED OR TIN/LEAD PLATED
IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS
NOTE
1Analog Devices reserves the right to ship either cerdip (Q-24, Q-28)
or ceramic (D-24A, D-28) hermetic packages.
REV. D
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD7828.PDF ] | |
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