AD7476ART Analog Devices, AD7476ART Datasheet - Page 16

• Manufacturer Part Number: AD7476ART
• Description: 1 MSPS/ 12-/10-/8-Bit ADCs in 6-Lead SOT-23
• Manufacturer: Analog Devices

AD7476/AD7477/AD7478
AD7476/AD7477/AD7478 to DSP56xxx Interface
The connection diagram in Figure 26 shows how the AD7476/
AD7477/AD7478 can be connected to the SSI (Synchronous
Serial Interface) of the DSP56xxx family of DSPs from Motorola.
The SSI is operated in Synchronous Mode (SYN bit in CRB
=1) with internally generated 1-bit clock period frame sync
for both Tx and Rx (Bits FSL1 = 1 and FSL0 = 0 in CRB). Set
the word length to 16 by setting bits WL1 = 1 and WL0 = 0 in
CRA. To implement the power-down mode on the AD7476/
AD7477/AD7478, the word length can be changed to eight bits
by setting bits WL1 = 0 and WL0 = 0 in CRA. It should be
noted that for signal processing applications, it is imperative
that the frame synchronization signal from the DSP56xxx will
provide equidistant sampling.
AD7476/
AD7477/
AD7478*
*ADDITIONAL PINS OMITTED FOR CLARITY
SDATA
SCLK
CS
0.051 (1.30)
0.035 (0.90)
0.071 (1.80)
0.059 (1.50)
SCK
SRD
SC2
0.006 (0.15)
0.000 (0.00)
PIN 1
DSP56xxx*
6
1
Dimensions shown in inches and (mm).
0.075 (1.90)
0.122 (3.10)
0.106 (2.70)
OUTLINE DIMENSIONS
BSC
5
2
0.020 (0.50)
0.010 (0.25)
6-Lead SOT-23
4
3
0.037 (0.95) BSC
(RT-6)
0.118 (3.00)
0.098 (2.50)
0.057 (1.45)
0.035 (0.90)
SEATING
PLANE
AD7476/AD7477/AD7478 to MC68HC16 Interface
The Serial Peripheral Interface (SPI) on the MC68HC16 is
configured for Master Mode (MSTR = 1), Clock Polarity Bit
(CPOL) = 1 and the Clock Phase Bit (CPHA) = 0. The SPI is
configured by writing to the SPI Control Register (SPCR)—see
68HC16 User Manual. The serial transfer will take place as a
16-bit operation when the SIZE bit in the SPCR register is set
to SIZE = 1. To implement the power-down mode with an
8-bit transfer set SIZE = 0. A connection diagram is shown in
Figure 27.
0.009 (0.23)
0.003 (0.08)
AD7478*
AD7476/
AD7477/
10
0
*ADDITIONAL PINS OMITTED FOR CLARITY
SDATA
SCLK
0.022 (0.55)
0.014 (0.35)
CS
SCLK/PMC2
MISO/PMC0
SS/PMC3
MC68HC16*