MAX5138BGTE+ Maxim Integrated Products, MAX5138BGTE+ Datasheet - Page 11

• Manufacturer Part Number: MAX5138BGTE+
• Description: IC DAC 16BIT SGL 16-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5138BGTE+

• Settling Time: 5µs
• Number Of Bits: 16
• Data Interface: DSP, I²C, MICROWIRE™, Parallel, QSPI™, SPI™
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Interface Type: Serial (SPI, QSPI, Microwire, DSP)
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 1176.5 mW
• Minimum Operating Temperature: - 40 C
• Supply Current: 1 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX5138’s DAC code is unipolar binary with V
= (code/65536) x V
face commands.
The MAX5139’s DAC code is unipolar with V
(code/4096) x V
commands.
Connect the MAX5138/MAX5139 DVDD supply to the
supply of the host DSP or microprocessor. The AVDD
supply may be set to any voltage within the 2.7V to
5.25V operating range, but must be greater than or
equal to the DVDD supply.
Write to the MAX5138/MAX5139 using the following
sequence:
1) Drive CS low, enabling the shift register.
2) Clock 24 bits of data into DIN (C7 first and D0 last),
Figure 2. Connections for MICROWIRE
Figure 4. READY Timing
observing the specified setup and hold times. Bits
READY 1
READY 2
READY 3
*THE READY-TO-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE
*MAX5138/MAX5139 BUT MAY BE USED FOR TRANSMISSION VERIFICATION.
SCLK
DIN
CS
Writing to the MAX5138/MAX5139
MAX5138
MAX5139
1
REF
2
______________________________________________________________________________________
READY*
REF
. See Table 1 for the serial interface
3
SCLK
DIN
CS
. See Table 1 for the serial inter-
4
SLAVE 1 DATA
20
21
SO
SK
SI*
I/O
22
MICROWIRE
23 24
PORT
Buffered Voltage-Output DACs
Low-Power, Single, 16-/12-Bit,
1
OUT
2
OUT
3
=
4
SLAVE 2 DATA
5
3) After clocking in the last data bit, drive CS high. CS
Figure 1 shows a write operation for the transmission of
24 bits. If CS is driven high at any point prior to receiving
24 bits, the transmission is discarded.
Connect READY to a microcontroller (µC) input to moni-
tor the serial interface for valid communications. The
READY pulse appears 24 clock cycles after the nega-
tive edge of CS (Figure 4). Since the MAX5138/
MAX5139 look at the first 24 bits of the transmission fol-
lowing the falling edge of CS, it is possible to daisy
chain devices with different command word lengths.
READY goes high 16ns after CS is driven high.
Figure 3. Connections for SPI/QSPI
D15–D0 are the data bits that are written to the
internal register.
must remain high for 33ns before the next transmis-
sion is started.
21
*THE READY-TO-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE
MAX5138/MAX5139 BUT MAY BE USED FOR TRANSMISSION VERIFICATION.
22
23 24
MAX5138
MAX5139
1
READY*
2
SCLK
DIN
CS
3
4
SLAVE 3 DATA
5
MOSI
MISO*
SCK
I/O
21
SPI/QSPI
PORT
+5V
22
SS
23 24
READY
11