MAX19708ETM+T Maxim Integrated Products, MAX19708ETM+T Datasheet - Page 25

• Manufacturer Part Number: MAX19708ETM+T
• Description: IC ANLG FRNT END 48-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX19708ETM+T

• Number Of Bits: 10
• Number Of Channels: 4
• Power (watts): 36.9mW
• Voltage - Supply, Analog: 3V
• Voltage - Supply, Digital: 3V
• Package / Case: 48-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

in this mode because both the Tx and Rx cores are
always on. To prevent bus contention in these states,
the Rx ADC output buffers are tri-stated during Tx and
the Tx DAC input bus is tri-stated during Rx.
In SLOW mode, the Rx ADC core is off during Tx; like-
wise the Tx DAC and filters are turned off during Rx to
yield lower power consumption in these modes. For
example, the power in SLOW Tx mode is 35.1mW. The
power consumption during Rx is 24mW compared to
41.1mW power consumption in FAST mode. However,
the recovery time between states is increased. The
switching time in SLOW mode between Rx to Tx is 7µs
and Tx to Rx is 8.1µs.
Bit E3 in the ENABLE-16 or ENABLE-8 register deter-
mines whether the device Tx-Rx mode is controlled
externally through the T/R input (E3 = low) or through the
SPI command (E3 = high). By default, the MAX19708 is
in the external Tx-Rx control mode. In the external control
mode, use the T/R input (pin 27) to switch between Rx
Figure 7. Serial-Interface Timing Diagram
DOUT
SCLK
DIN
CS
t
DOUT = TRI-STATED WHEN
CSW
AUX-ADC IS IDLE
t
CSS
16-BIT OR 8-BIT WRITE INTO SPI (DIN)
D11 (16-BIT)
t
DS
D3 (8-BIT)
MSB
______________________________________________________________________________________
t
t
External
CH
DH
t
CP
t
D10 (16-BIT)
CL
D2 (8-BIT)
T/R R Switching Control vs.
Serial-Interface Control
DOUT = ACTIVE WHEN
BIT AD0 IS SET
LSB
A0
10-Bit, 11Msps, Ultra-Low-Power
t
CS
t
CSD
16-BIT OR 8-BIT WRITE
AUX-ADC CONVERSION
INTO SPI DURING
MSB
t
CONV
LSB
AUX-ADC
IS BUSY
and Tx modes. Using the T/R pin provides faster switch-
ing between Rx and Tx modes. To override the external
Tx-Rx control, program the MAX19708 through the serial
interface. During SHDN, IDLE, or STBY modes, the T/R
input is overridden. To restore external Tx-Rx control,
program bit E3 low and exit the SHDN, IDLE, or STBY
modes through the serial interface.
The serial digital interface is a standard 3-wire connec-
tion (CS, SCLK, DIN) compatible with SPI/QSPI™/
MICROWIRE/DSP interfaces. Set CS low to enable the
serial data loading at DIN or output at DOUT. Following a
CS high-to-low transition, data is shifted synchronously,
most significant bit first, on the rising edge of the serial
clock (SCLK). After 16 bits are loaded into the serial
input register, data is transferred to the latch when CS
transitions high. CS must transition high for a minimum of
80ns before the next write sequence. The SCLK can idle
either high or low between transitions. Figure 7 shows
the detailed timing diagram of the 3-wire serial interface.
QSPI is a trademark of Motorola, Inc.
t
DCS
DATA READY
AUX-ADC
SIMULTANEOUS 16-BIT WRITE INTO SPI (DIN)
BIT D11
Analog Front-End
10-BIT READ OUT OF AUX-ADC (DOUT) WITH
(DIN)
MSB
t
CD
BIT D10
(DOUT)
(DIN)
BIT D9
MSB
BIT D1
(DIN)
(DOUT)
BIT D0
LSB
BIT A0
(DIN)
LSB
(HELD)
BIT D0
LSB
SPI Timing
t
CHZ
CLEARED
STATED
BIT AD0
DOUT
TRI-
25