MAX187EVKIT-DIP Maxim Integrated, MAX187EVKIT-DIP Datasheet - Page 6

• Manufacturer Part Number: MAX187EVKIT-DIP
• Description: Data Conversion IC Development Tools Programmers, Development Systems
• Manufacturer: Maxim Integrated
• Series: MAX187, MAX189r

Specifications of MAX187EVKIT-DIP

• Interface Type: QSPI, Serial (SPI, Microwire)
• Factory Pack Quantity: 1

6) Set CS high.
7) Extract the 12 significant bits from the read queue.
Figure 2 is the timing diagram for the QSPI interface.
Listing 1 is an assembly-code listing that shows how to
use the QSPI to read the MAX187.
The QSPI is not required by the MAX187. The MAX187
may be read by any equivalent bit-pushing algorithm. The
following algorithm reads the MAX187 by setting and
clearing I/O bits, and is functionally equivalent to the QSPI.
1) Assert SCK low.
2) Assert CS low.
3) Clear a 16-bit register that will be used to store the
4) Wait until DOUT becomes high.
5) Set SCK high.
6) Assert SCK low.
7) Repeat 12 times:
MAX187 Evaluation System/Evaluation Kit
Figure 2. MAX187 to QSPI Interface Timing (CPOL = 0, CHPA = 1)
6
The data is right-justified.
reading.
_______________________________________________________________________________________
(PCS0)
(MISO)
(SCK)
DOUT
SCLK
CS
Using Bit-Pushing to Read the MAX187
7.1) Set SCK high.
7.2) Rotate the 16-bit reading register left one bit
1
2
3
4
5
(i.e. multiply by two).
CONVERSION TIME – MAX187: 8.5µs MAX
DELAY BEORE QSPI CLOCK: DSCKL (8.5µs) (16.78MHz) = 143 (BUT DSCKL MUST BE LESS THAN 128,
MAX187 SCK TO DOUT DELAY: 150ns MAX
QSPI SETUP TIME: 30ns MIN
SCK PERIOD: 30ns + 150ns = 180ns MIN
1
2
MAX FREQUENCY =
SPBR = 2 SETS BAUD RATE TO
ACTUAL SCK PERIOD =
START BIT
SO IT CANNOT BE USED UNLESS THE SYSTEM CLOCK SPEED IS REDUCED)
180ns
1
4.195MHz
1
= 5.56MHz MAX
16.78MHz
2 x 2
= 238ns
D11
= 4.195MHz
4
READ
QSPI
5
3
8) Set CS high.
9) Extract the 12 significant bits from the 16-bit result
____________Evaluating the MAX189
The MAX187 EV kit supports both the MAX187 and
MAX189 ICs. The only difference between the two
devices is that the MAX189 requires an external refer-
ence. Refer to the MAX187/MAX189 data sheet for the
MAX189 reference requirements.
The central component of the evaluation board is the
MAX187 analog-to-digital converter (ADC). Capacitor
C1 is close to pin 1, C3 is close to pin 4, and analog
ground is star grounded at pin 5. DC offset error may
be improved by adding a 0.1µF capacitor between
INPUT and AGND.
________________________of Hardware
register. The data is right-justified.
D10
7.3) Read DOUT into least significant bit of
7.4) Clear SCK low.
reading register.
D9
Detailed Description
D0
MAX187 ADC