MAX5138BGTE+ Maxim Integrated Products, MAX5138BGTE+ Datasheet - Page 10

• 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

Low-Power, Single, 16-/12-Bit,
Buffered Voltage-Output DACs
The external reference input features a typical input
impedance of 113kΩ and accepts an input voltage
from +2V to AVDD. Connect an external voltage
supply between REFI and AGND to apply an ex-
ternal reference. Leave REFO unconnected. Visit
www.maxim-ic.com/products/references for a list of
available external voltage-reference devices.
Connect AVDD to REFI to use AVDD as the reference
voltage. Leave REFO unconnected.
The MAX5138/MAX5139 3-wire serial interface is com-
patible with MICROWIRE, SPI, QSPI, and DSPs (Figures
2, 3). The interface provides three inputs, SCLK, CS,
and DIN and one output, READY. Use READY to verify
communication or to daisy-chain multiple devices (see
the READY section). READY is capable of driving a
20pF load with a 30ns (max) delay from the falling edge
of SCLK. The chip-select input (CS) frames the serial
data loading at DIN. Following a chip-select input’s
Table 1. Operating Mode Truth Table
* For the MAX5139, D3–D0 are X = don’t-care bits.
10
C7 C6 C5 C4 C3 C2 C1 C0 D15 D14 D13 D12 D11 D10 D9 D8
MSB
0
0
0
0
0
0
0
0
______________________________________________________________________________________
0
0
0
0
0
0
0
0
CONTROL BITS
0
0
0
0
0
0
1
1
0
0
0
0
0
1
1
0
X
X
0
0
0
0
0
0
0
0
0
0
1
X
X
0
X DAC D15 D14 D13 D12 D11 D10 D9 D8
X DAC D15 D14 D13 D12 D11 D10 D9 D8
0
0
1
1
0
0
0
1
0
1
1
0
X
X
X
X
X
0
AVDD as Reference
External Reference
Serial Interface
24-BIT WORD
X
X
X
X
X
0
X
X
X
X
X
0
X
X
X
X
X
0
X
X
X
X
X
0
DATA BITS
X
X
X
X
0
X
LIN
high-to-low transition, the data is shifted synchronously
and latched into the input register on each falling edge
of the serial-clock input (SCLK). Each serial word is 24
bits. The first 8 bits are the control word followed by 16
data bits (MSB first), as shown in Table 1. The serial
input register transfers its contents to the input registers
after loading 24 bits of data. To initiate a new data
transfer, drive CS high and keep CS high for a minimum
of 33ns before the next write sequence. The SCLK can
be either high or low between CS write pulses. Figure 1
shows the timing diagram for the complete 3-wire serial-
interface transmission.
The MAX5138/MAX5139 digital input is double buffered.
Depending on the command issued through the serial
interface, the input register can be loaded without affect-
ing the DAC register using the write command. To update
the DAC register, either pulse the LDAC input low, or use
the software LDAC command. Use the writethrough com-
mands (see Table 1) to update the DAC output immedi-
ately after the data is received. Only use the writethrough
command to update the DAC output immediately.
X
X DAC
X
X DAC READY_EN
X
X
X
X
0
D7
D7
D7
X
X
X
X
0
D6–D0
LSB
D6
D6
X
X
X
X
X
0
Linearity Optimize DAC linearity.
through
Control
DESC
Power
LDAC
Write-
Write
NOP
NOP
CLR
No operation.
Set DAC = 1 to move
contents of input to DAC
register.
Software clear.
Set DAC = 1 to power
down DAC. Set
READY_EN = 1 to
enable READY.
Write to selected input
registers (DAC output
not affected).
Write to selected input
and DAC register,
DAC output updated
(writethrough).
No operation.
FUNCTION