MAX186CCAP-T Maxim Integrated, MAX186CCAP-T Datasheet - Page 20

• Manufacturer Part Number: MAX186CCAP-T
• Description: Analog to Digital Converters - ADC
• Manufacturer: Maxim Integrated

Specifications of MAX186CCAP-T

• Number Of Channels: 8/4
• Architecture: SAR
• Conversion Rate: 133 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended/Differential
• Snr: Yes
• Interface Type: 4-Wire (SPI, Microwire, QSPI, TMS320)
• Operating Supply Voltage: +/- 5 V, + 5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-20
• Maximum Power Dissipation: 640 mW
• Minimum Operating Temperature: 0 C
• Number Of Converters: 1
• Voltage Reference: 4.096 V

Low-Power, 8-Channel,
Serial 12-Bit ADCs
Figure 18. Power-Supply Grounding Connection
Figure 19. MAX186 QSPI Connection
20
______________________________________________________________________________________
* OPTIONAL
V
+5V
ANALOG
DD
INPUTS
R* = 10
MAX186/MAX188
AGND
10
1
2
3
4
5
6
7
8
9
SUPPLIES
V
-5V
SHDN
SS
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
DGND
MAX186
REFADJ
SSTRB
DGND
DOUT
AGND
SCLK
VREF
V
+5V
DIN
CIRCUITRY
CS
DD
DIGITAL
20
19
18
17
16
15
14
13
12
11
DGND
GND
0.1µF
0.1µF
+
4.7µF
4.7µF
The MAX186/MAX188 can interface with QSPI at high
throughput rates using the circuit in Figure 19. This
QSPI circuit can be programmed to do a conversion on
each of the eight channels. The result is stored in mem-
ory without taxing the CPU since QSPI incorporates its
own micro-sequencer. Figure 19 depicts the MAX186,
but the same circuit could be used with the MAX188 by
adding an external reference to VREF and connecting
REFADJ to V
Figure 20 details the code that sets up QSPI for
autonomous operation. In external clock mode, the
MAX186/MAX188 perform a single-ended, unipolar con-
version on each of their eight analog input channels.
Figure 21, QSPI Assembly-Code Timing, shows the tim-
ing associated with the assembly code of Figure 20. The
first byte clocked into the MAX186/MAX188 is the control
byte, which triggers the first conversion on CH0. The last
two bytes clocked into the MAX186/MAX188 are all zero
and clock out the results of the CH7 conversion.
High-Speed Digital Interfacing with QSPI
0.01µF
+5V
* CLOCK CONNECTIONS NOT SHOWN
DD
.
SCK
PCS0
MOSI
MISO
V
DDI
, V
V
DDE
SSI
MC68HC16
, V
DDSYN
VSSE
, V
STBY