OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

AD7819YNZ

P1-P3P4-P6P7-P9P10-P12
REV. B
AD7819
–9–
PARALLEL INTERFACE
The parallel interface of the AD7819 is eight bits wide. The out-
put data buffers are activated when both CS and RD are logic
low. At this point the contents of the data register are placed on
the 8-bit data bus. Figure 15 shows the timing diagram for the par-
allel port. The Parallel Interface of the AD7819 is reset when
BUSY goes logic high. Care must be taken to ensure that a read
operation does not occur while BUSY is high. Data read from
the AD7819 while BUSY is high will be invalid. For optimum
performance the read operation should end at least 100 ns (t
8
)
prior to the falling edge of the next CONVST.
8 MSBs
t
1
t
2
t
3
t
POWER-UP
EXT CONVST
INT CONVST
BUSY
CS/RD
DB7–DB0
Figure 13. Mode 1 Operation
8 MSBs
t
1
t
3
EXT CONVST
INT CONVST
BUSY
CS/RD
DB7–DB0
t
POWER-UP
Figure 14. Mode 2 Operation
8 MSBs
CONVST
BUSY
CS
DB7–DB0
t
2
t
3
t
1
t
4
t
6
t
7
t
5
t
8
RD
Figure 15. Parallel Port Timing
REV. B
AD7819
–10–
MICROPROCESSOR INTERFACING
The parallel port on the AD7819 allows the device to be inter-
faced to a range of many different microcontrollers. This section
explains how to interface the AD7819 with some of the more
common microcontroller parallel interface protocols.
AD7819 to 8051
Figure 16 shows a parallel interface between the AD7819 and
the 8051 microcontroller. The BUSY signal on the AD7819 pro-
vides an interrupt request to the 8051 when a conversion begins.
Port 0 of the 8051 may serve as an input or output port, or as in
this case when used together, may be used as a bidirectional
low-order address and data bus. The address latch enable out-
put of the 8051 is used to latch the low byte of the address
during accesses to the device, while the high-order address byte
is supplied from Port 2. Port 2 latches remain stable when the
AD7819 is addressed, as they do not have to be turned around
(set to 1) for data input as is the case for Port 0.
AD7819*
8051*
AD0–AD7
ALE
A8–A15
RD
INT
LATCH
DECODER
DB0–DB7
CS
RD
BUSY
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 16. Interfacing to the 8051
AD7819 to PIC16C6x/7x
Figure 17 shows a parallel interface between the AD7819 and the
PIC16C64/65/74. The BUSY signal on the AD7819 provides
an interrupt request to the microcontroller when a conversion
begins. Of the PIC16C6x/7x range of microcontrollers, only
the PIC16C64/65/74 can provide the option of a parallel slave
port. Port D of the microcontroller will operate as an 8-bit
wide parallel slave port when control bit PSPMODE in the
TRISE register is set. Setting PSPMODE enables the port pin
RE0 to be the RD output and RE2 to be the CS output. For
this functionality, the corresponding data direction bits of the
TRISE register must be configured as outputs (reset to 0). See
user PIC16/17 Microcontroller User Manual.
Figure 17. Interfacing to the PIC16C6x/7x
AD7819 to ADSP-21xx
Figure 18 shows a parallel interface between the AD7819 and
the ADSP-21xx series of DSPs. As before, the BUSY signal on
the AD7819 provides an interrupt request to the DSP when a
conversion begins.
Figure 18. Interfacing to the ADSP-21xx
REV. B
AD7819
–11–
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Lead Plastic DIP
(N-16)
16
18
9
0.840 (21.33)
0.745 (18.93)
0.280 (7.11)
0.240 (6.10)
PIN 1
SEATING
PLANE
0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)
0.210 (5.33)
MAX
0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.100
(2.54)
BSC
0.160 (4.06)
0.115 (2.93)
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
16-Lead Small Outline Package
(R-16A)
16 9
81
0.3937 (10.00)
0.3859 (9.80)
0.2550 (6.20)
0.2284 (5.80)
0.1574 (4.00)
0.1497 (3.80)
PIN 1
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
0.0688 (1.75)
0.0532 (1.35)
0.0500
(1.27)
BSC
0.0099 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8°
0°
0.0196 (0.50)
0.0099 (0.25)
x 45°
16-Lead Thin Shrink Small Outline Package
(RU-16)
16
9
8
1
0.201 (5.10)
0.193 (4.90)
0.256 (6.50)
0.246 (6.25)
0.177 (4.50)
0.169 (4.30)
PIN 1
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.0118 (0.30)
0.0075 (0.19)
0.0256
(0.65)
BSC
0.0433
(1.10)
MAX
0.0079 (0.20)
0.0035 (0.090)
0.028 (0.70)
0.020 (0.50)
8°
0°
C01318–0–10/00 (rev. B)
PRINTED IN U.S.A.
P1-P3P4-P6P7-P9P10-P12

AD7819YNZ

Mfr. #:
Buy AD7819YNZ
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 2.7V-5.5V 200kSPS 8-Bit Sampling
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet