MAX5550ETE+ Maxim Integrated Products, MAX5550ETE+ Datasheet - Page 8

• Manufacturer Part Number: MAX5550ETE+
• Description: IC DAC 10BIT DUAL 30MA 16-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5550ETE+

• Settling Time: 30µs
• Number Of Bits: 10
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Conversion Rate: 10 MSPs
• Resolution: 10 bit
• Interface Type: Serial (SPI, I2C)
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Current: 6 mA
• Voltage Reference: Internal
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX5550 10-bit, dual current-steering DAC (see
the Functional Diagram) operates with DAC update
rates up to 10Msps in SPI mode and 400ksps in I
mode. The converter consists of a 16-bit shift register
and input DAC registers, followed by a current-steering
array. The current-steering array generates full-scale
currents up to 30mA per DAC. An integrated +1.25V
bandgap reference, control amplifier, and an external
resistor determine each data converter’s full-scale out-
put range.
The MAX5550 provides an internal +1.25V bandgap ref-
erence or accepts an external reference voltage source
between +0.5V and +1.5V. REFIN serves as the input for
an external low-impedance reference source. Leave
REFIN unconnected in internal reference mode. Internal
or external reference mode is software selectable
through the SPI/I
Dual, 10-Bit, Programmable, 30mA
High-Output-Current DAC
8
6, 13, 15
8, 16
PIN
_______________________________________________________________________________________
10
11
12
14
—
1
2
3
4
5
7
9
Reference Architecture and Operation
SCLK/SC
DOUT/A1
DIN/SDA
FSADJB
FSADJA
SPI/I2C
NAME
CS/A0
REFIN
OUTB
OUTA
GND
N.C.
V
EP
DD
2
C serial interface.
Serial Clock Input. Connect SCL to V
Serial Data Input. Connect SDA to V
Chip-Select Input in SPI Mode/Address Select 0 in I
or GND to set the device address in I
SPI/I2C Select Input. Connect SPI/I2C to V
mode.
Serial Data Output in SPI Mode/Address Select 1 in I
other devices or to read back in SPI mode. The digital data is clocked out on SCLK’s falling edge. Connect
A1 to V
No Connection. Leave unconnected or connect to GND.
Refer ence Inp ut. D r i ve RE FIN w i th an exter nal r efer ence sour ce b etw een + 0.5V and + 1.5V . Leave RE FIN
unconnected i n i nter nal r efer ence m od e. Byp ass w i th a 0.1µF cap aci tor to GN D as cl ose to the d evi ce as p ossi b l e.
Ground
DACB Output. OUTB provides up to 30mA of output current.
D AC B Ful l - S cal e Ad j ust Inp ut. For m axi m um ful l - scal e outp ut cur r ent, connect a 20kΩ r esi stor b etw een FS AD JB
and GN D . For m i ni m um ful l - scal e cur r ent, connect a 40kΩ r esi stor b etw een FS AD JB and GN D .
D AC A Ful l - S cal e Ad j ust Inp ut. For m axi m um ful l - scal e outp ut cur r ent, connect a 20kΩ r esi stor b etw een FS AD JA
and GN D . For m i ni m um ful l - scal e cur r ent, connect a 40kΩ r esi stor b etw een FS AD JA and GN D .
DACA Output. OUTA provides up to 30mA of output current.
Power Supply Input. Connect V
capacitor as close to the device as possible.
Exposed Pad. Connect to GND. Do not use as a substitute ground connection.
Detailed Description
DD
or GND to set the device address in I
Architecture
DD
to a +2.7 to +5.25V power supply. Bypass V
DD
2
DD
2
C
C mode.
through a 2.4kΩ resistor in I
through a 2.4kΩ resistor in I
DD
The MAX5550’s reference circuit (Figure 1) employs a
control amplifier to regulate the full-scale current (I
the current outputs of the DAC. This device has a soft-
ware-selectable full-scale current range (see the com-
mand summary in Table 4). After selecting a current
range, an external resistor (R
current. See Table 1 for a matrix of I
selections.
During startup, when the power is first applied, the
MAX5550 defaults to the external reference mode, and
to the 1mA–2mA full-scale current-range mode.
The 10-bit DAC data is decoded as offset binary, MSB
first, with 1 LSB = I
responding current as shown in Table 2.
The MAX5550 features a pin-selectable SPI/I
interface. Connect SPI/I2C to GND to select I
connect SPI/I2C to V
SCL (I
facilitate communication between the MAX5550 and the
master. The serial interface remains active in shutdown.
to select SPI mode, or connect SPI/I2C to GND to select I
2
FUNCTION
C mode.
2
C Mode. CS is an active-low input. Connect A0 to V
2
2
C Mode. Use DOUT to daisy chain the MAX5550 to
C mode) and DIN, SCLK, and CS (SPI mode)
FS
2
2
C mode.
C mode.
/ 1024, and converted into the cor-
DD
to select SPI mode. SDA and
DD
FSADJ
Serial Interface
Pin Description
to GND with a 0.1µF
_) sets the full-scale
FS
and R
DAC Data
2
C mode, or
2
C serial
FS
FSADJ
2
DD
C
) for