star-point (Figure 11) connecting the two ground sys-
tems (analog and digital). For lowest-noise operation,
ensure the ground return to the star ground’s power
supply is low impedance and as short as possible.
Route digital signals far away from sensitive analog and
reference inputs.
High-frequency noise in the power supply (V
DD
) could
influence the proper operation of the ADC’s fast com-
parator. Bypass V
DD
to the star ground with a network
of two parallel capacitors, 0.1µF and 1µF, located as
close as possible to the power supply pin of the
MAX157/MAX159. Minimize capacitor lead length for
best supply-noise rejection and add an attenuation
resistor (10) if the power supply is extremely noisy.
MAX157/MAX159
+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
______________________________________________________________________________________ 13
SCK
SDI
GND GND
I/O
SCLK
DOUT
CS/SHDN
V
DD
V
DD
MAX157
MAX159
PIC16/PIC17
CHID D9 D8 D7 D6
1 2 3 4 5 6 7 8 9 10111213141516
D5 D4 D3 D2 D1
HIGH-Z
DOUT*
CS/SHDN
SCLK
1ST BYTE READ 2ND BYTE READ
SAMPLING INSTANT
*WHEN CS/SHDN IS HIGH, DOUT = HIGH - Z
MSB
LSB
D0 S1 S0
Figure 10b. SPI Interface Timing Sequence with PIC16/17 in Master Mode (CKE = 1, CKP = 0, SMP = 0, SSPM3–SSPM0 = 0001)
Figure 10a. SPI Interface Connection for a PIC16/PIC17
Controller
CHID D9 D8 D7 D6
1 2 3 4 5 6 7 8 9 10111213141516
D5 D4 D3 D2 D1
HIGH-Z
DOUT
CS/SHDN
SCLK
SAMPLING INSTANT
*WHEN CS/SHDN IS HIGH, DOUT = HIGH - Z
MSB LSB
D0 S1 S0
Figure 9b. QSPI Interface Timing Sequence (CPOL = CPHA = 0)
+3V
GND+3V
POWER SUPPLIES
DGND+3V
GNDV
DD
DIGITAL
CIRCUITRY
MAX157
MAX159
R* = 10
1µF
0.1µF
* OPTIONAL FILTER RESISTOR
Figure 11. Power-Supply Bypassing and Grounding
MAX157/MAX159
+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
14 ______________________________________________________________________________________
Table 3. Detailed SSPSTAT Register Content
Table 2. Detailed SSPCON Register Content
CONTROL BIT
MAX157/MAX159
SETTINGS
SYNCHRONOUS SERIAL PORT CONTROL REGISTER (SSPCON)
WCOL Bit 7 X Write Collision Detection Bit
SSPOV Bit 6 X Receive Overflow Detect Bit
SSPEN Bit 5 1
Synchronous Serial Port Enable Bit
0: Disables serial port and configures these pins as I/O port pins.
1: Enables serial port and configures SCK, SDO and SCI pins as serial port pins.
CKP Bit 4 0 Clock Polarity Select Bit. CKP = 0 for SPI master mode selection.
SSPM3 Bit 3 0
SSPM2 Bit 2 0
SSPM1 Bit 1 0
SSPM0 Bit 0 1
Synchronous Serial Port Mode Select Bit. Sets SPI master mode and selects
f
CLK
= f
OSC
/ 16.
X = Don’t care
X = Don’t care
D/A
CONTROL BIT
MAX157/MAX159
SETTINGS
SYNCHRONOUS SERIAL STATUS REGISTER (SSPSTAT)
Bit 5 X Data Address Bit
P Bit 4 X Stop Bit
S Bit 3 X
R/W
SMP Bit 7 0
SPI Data Input Sample Phase. Input data is sampled at the middle of the data output
time.
CKE Bit 6 1 SPI Clock Edge Select Bit. Data will be transmitted on the rising edge of the serial clock.
Bit 2 X
UA Bit 1 X
BF Bit 0 X
Start Bit
Buffer Full Status Bit
Update Address
Read/Write Bit Information
MAX157/MAX159
+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
______________________________________________________________________________________ 15
Package Information
Chip Information
TRANSISTOR COUNT: 2,058
SUBSTRATE CONNECTED TO GND
8LUMAXD.EPS

MAX159BCUA+T

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Analog to Digital Converters - ADC 10-Bit 108ksps 5.25V Precision ADC
Lifecycle:
New from this manufacturer.
Delivery:
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