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AD7813YNZ View Datasheet(PDF) - Analog Devices

Part NameAD7813YNZ ADI
Analog Devices ADI
Description2.7 V to 5.5 V, 400 kSPS 8-/10-Bit Sampling ADC
AD7813YNZ Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
EXT CONVST
t POWER-UP
INT CONVST
BUSY
t1
t2
t3
AD7813
CS/RD
DB7DB0
EXT CONVST
INT CONVST
BUSY
8 MSBs
Figure 13. Mode 1 Operation
t POWER-UP
t1
t3
2 LSBs
CS/RD
DB7DB0
8 MSBs
Figure 14. Mode 2 Operation
PARALLEL INTERFACE
The parallel interface of the AD7813 is eight bits wide. The
output 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 dia-
gram for the parallel port. As previously explained, two succes-
sive read operations must take place in order to access the 10-bit
conversion result. The first read places the 8 MSBs on the data
bus and the second read places the 2 LSBs on the data bus. The
2 LSBs appear on DB7 and DB6, with DB5–DB0 set to logic zero.
Further read operations will access the 8 MSBs and 2 LSBs of
the 10-bit ADC conversion result again. The parallel interface
of the AD7813 is reset when BUSY goes logic high. This feature
allows the AD7813 to be used as an 8-bit converter if the user
only wishes to access the 8 MSBs of the conversion. Care must
be taken to ensure that a read operation does not occur while
BUSY is high. Data read from the AD7813 while BUSY is high
will be invalid. For optimum performance the read operation
should end at least 100 ns (t10) prior to the falling edge of the
next CONVST.
CONVST
t3
BUSY
CS
RD
DB7DB0
t2
t1
t4
t6
t8
t5
t7
8 MSBs
t9
2 MSBs
Figure 15. Parallel Port Timing
REV. C
9
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GENERAL DESCRIPTION
The AD7813 is a high-speed, microprocessor-compatible, 8-/10-bit analog-to-digital converter with a maximum throughput of 400 kSPS. The converter operates off a single 2.7 V to 5.5 V supply and contains a 2.3 µs successive approximation A/D converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. The 10-bit conversion result is read by carrying out two 8-bit read opera tions. The first read operation accesses the 8 MSBs of the ADC conversion result and the second read accesses the 2 LSBs. Using only address decoding logic the AD7813 is easily mapped into the microprocessor address space.

FEATURES
   8-/10-Bit ADC with 2.3 μs Conversion Time
   On-Chip Track and Hold
   Operating Supply Range: 2.7 V to 5.5 V
   Specifications at 2.7 V–3.6 V and 5 V  10%
   8-Bit Parallel Interface
      8-Bit + 2-Bit Read
   Power Performance
      Normal Operation
         10.5 mW, VDD = 3 V
      Automatic Power-Down
         34.6 μW @ 1 kSPS, VDD = 3 V
   Analog Input Range: 0 V to VREF
   Reference Input Range: 1.2 V to VDD

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