AD7887BRZ Analog Devices Inc, AD7887BRZ Datasheet - Page 19

• Manufacturer Part Number: AD7887BRZ
• Description: IC ADC 12BIT 2CHAN SRL 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD7887BRZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Design Resources: Software Calibrated, 1 MHz to 8 GHz, 70 dB RF Power Measurement System Using AD8318 (CN0150)
• Number Of Bits: 12
• Sampling Rate (per Second): 125k
• Number Of Converters: 1
• Power Dissipation (max): 3.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Resolution (bits): 12bit
• Sampling Rate: 125kSPS
• Input Channel Type: Single Ended
• Supply Voltage Range - Analog: 2.7V To 5.25V
• Supply Current: 850µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7887 to MC68HC11
The serial peripheral interface (SPI) on the MC68HC11 is
configured for master mode (MSTR = 1) when the clock
polarity bit (CPOL) = 1 and the clock phase bit (CPHA) = 1.
The SPI is configured by writing to the SPI Control Register
(SPCR)—see the M68HC11 reference manual from Freescale
Semiconductor, Inc., for more information. The serial transfer
takes place as two 8-bit operations. A connection diagram is
shown in Figure 25.
AD7887 to 8051
It is possible to implement a serial interface using the data ports
on the 8051. This allows a full duplex serial transfer to be imple-
mented. The technique involves bit-banging an input/output
port (for example, P1.0) to generate a serial clock and using two
other input/output ports (for example, P1.1 and P1.2) to shift
data in and out—see Figure 26.
1
ADDITIONAL PINS OMITTED FOR CLARITY.
AD7887
1
SCLK
DOUT
DIN
CS
Figure 25. Interfacing to the MC68HC11
SCLK/PD4
MISO/PD2
MOSI/PD3
PA0
MC68HC11
1
Rev. D | Page 19 of 24
AD7887 to PIC16C6x/PIC16C7x
The PIC16C6x synchronous serial port (SSP) is configured as an
SPI master with the clock polarity bit = 1. This is done by writing to
the synchronous serial port control register (SSPCON). See the
PIC16/PIC17 Microcontroller User Manual. Figure 27 shows the
hardware connections needed to interface to the PIC16C6x/
PIC16C7x. In this example, input/output port RA1 is being used to
pulse CS . This microcontroller only transfers eight bits of data
during each serial transfer operation. Therefore, two consecutive
read/write operations are needed.
1
1
ADDITIONAL PINS OMITTED FOR CLARITY.
ADDITIONAL PINS OMITTED FOR CLARITY.
AD7887
AD7887
Figure 26. Interfacing to the 8051 Using Input/Output Ports
Figure 27. Interfacing to the PIC16C6x/PIC16C7x
1
1
DOUT
SCLK
SCLK
DOUT
DIN
DIN
CS
CS
P1.0
P1.1
P1.2
P1.3
SCK/RC3
SDI/RC4
SDO/RC5
RA1
PIC16C7x
PIC16C6x/
8051
AD7887
1
1