MAX157 Maxim, MAX157 Datasheet - Page 13

• Manufacturer Part Number: MAX157
• Description: Dual-Channel CardBus and PCMCIA VCC/VPP Power-Switching Networks
• Manufacturer: Maxim

Figure 9b. QSPI Interface Timing Sequence (CPOL = CPHA = 0)
Figure 10a. SPI Interface Connection for a PIC16/PIC17
Controller
Figure 10b. SPI Interface Timing Sequence with PIC16/17 in Master Mode (CKE = 1, CKP = 0, SMP = 0, SSPM3–SSPM0 = 0001)
Figure 11. Power-Supply Bypassing and Grounding
CS/SHDN
DOUT*
*WHEN CS/SHDN IS HIGH, DOUT = HIGH - Z
SCLK
CS/SHDN
*WHEN CS/SHDN IS HIGH, DOUT = HIGH - Z
DOUT
SCLK
MAX157
MAX159
V
DD
CS/SHDN
108ksps, Serial 10-Bit ADCs in 8-Pin µMAX
DOUT
SCLK
GND
______________________________________________________________________________________
1
SAMPLING INSTANT
2
1
SAMPLING INSTANT
3
2
CHID
1ST BYTE READ
* OPTIONAL FILTER RESISTOR
V
+3V
DD
SCK
SDI
I/O
4
R* = 10
3
MSB
PIC16/PIC17
D9
CHID
5
V
4
DD
1 F
0.1 F
D8
MAX157
MAX159
MSB
+2.7V, Low-Power, 2-Channel,
D9
6
GND
GND
5
D7
7
D8
POWER SUPPLIES
6
D6
8
D7
7
D6
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
influence the proper operation of the ADC’s fast com-
parator. Bypass V
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 (10Ω) if the power supply is extremely noisy.
8
D5
9
D5
D4
+3V
+3V
CIRCUITRY
10
DIGITAL
D3
9
DGND
GND
11
D4
10
D2
12
DD
D3
11
D1
to the star ground with a network
13
2ND BYTE READ
D2
LSB
D0
12
14
D1
13
S1
15
LSB
D0
14
S0
16
S1
15
HIGH-Z
S0
16
DD
) could
HIGH-Z
13