ad5504 Analog Devices, Inc., ad5504 Datasheet

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ad5504

Manufacturer Part Number
ad5504
Description
High Voltage, Quad Channel 12-bit Voltage Output Dac
Manufacturer
Analog Devices, Inc.
Datasheet

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Preliminary Technical Data
FEATURES
Quad channel high voltage DAC
12-bit resolution
Pin selectable 30 V or 60 V output range
Integrated Precision Reference
Low power serial interface with readback capability
Integrated Temperature Sensor Alarm function
Power-On Reset
Simultaneous updating via LDAC
Wide operating temperature: −40°C to +105°C
APPLICATIONS
Programmable voltage source
Programmable current source
High Voltage LED Driver
Receiver bias in optical communications
GENERAL DESCRIPTION
The AD5504 is a four channel, 12-bit, serial input, digital-to-
analog converter with on-chip high voltage output amplifiers
and an integrated precision reference. The DAC output voltage
ranges are programmable via the range-select pin ( R_SEL ).If
R_SEL is held high the DAC output ranges are 0 V to 30 V. If
R_SEL is held low the DAC output ranges are 0 V to 60 V. The
on-chip output amplifiers allow an output swing within the
range of AGND + 0.2 V and V
The AD5504 has a high-speed serial interface, which is
compatible with SPI
interface standards and can handle clock speeds of up to
30MHz. The serial interface offers the user the capability of
both writing-to and reading-from most or the internal registers.
To reduce power consumption on power up, only the digital
section of the AD5504 is powered up initially. This gives the
user the ability to program the DAC registers to the required
value while only consuming typically 23 μA of supply current.
The AD5504 incorporates power-on-reset circuitry which
ensures the DAC registers powers up in a known condition and
remains there until a valid write to the device has taken place.
Rev. Pr B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
®
, QSPI
,MICROWIRE
DD
–0.5 V.
,and DSP
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The analog section is powered up by issuing a power-up
command via the SPI interface. The AD5504 provides software-
selectable output loads while in the power-down mode.
The AD5504 has on on-chip temperature sensor. If the
temperature on the die exceeds 130ºC the ALARM pin, an active
low CMOS output pin, flags an alarm and the AD5504 enters a
temperature power-down mode disconnecting the output
amplifier thus removing the short circuit condition. The AD5504
remains in power down mode until a software power-up
command is executed.
The AD5504 is available in a compact 16-lead TSSOP. The
AD5504 is guaranteed to operate over the extended temperature
range of −40°C to +105°C.
ALARM
SDO
High Voltage, Quad Channel
12-Bit Voltage Output DAC
POWER-ON
DGND
RESET
CONTROL
LOGIC
INPUT
FUNCTIONAL BLOCK DIAGRAM
12
REGISTER
REGISTER
REGISTER
REGISTER
INPUT
INPUT
INPUT
INPUT
A
B
C
D
©2008 Analog Devices, Inc. All rights reserved.
REGISTER
REGISTER
REGISTER
REGISTER
DAC
DAC
DAC
DAC
Figure 1.
A
B
C
D
12
12
12
12
REFERENCE
DAC B
DAC C
DAC D
DAC A
CONTROL LOGIC
122.36KΩ
122.36KΩ
122.36KΩ
122.36KΩ
POWERDOWN
1713KΩ
1713KΩ
1713KΩ
1713KΩ
AGND
AD5504
www.analog.com
AD5504
TEMPERATURE
SENSOR
V
V
V
V
OUTA
OUTB
OUTC
OUTD

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ad5504 Summary of contents

Page 1

... The AD5504 has on on-chip temperature sensor. If the temperature on the die exceeds 130ºC the ALARM pin, an active low CMOS output pin, flags an alarm and the AD5504 enters a temperature power-down mode disconnecting the output amplifier thus removing the short circuit condition. The AD5504 remains in power down mode until a software power-up command is executed ...

Page 2

... AD5504 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 AC Characteristics........................................................................ 4 Timing Characteristics ................................................................ 5 Absolute Maximum Ratings............................................................ 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics ............................................. 9 Terminology .................................................................................... 10 Theory of Operation ...................................................................... 11 Power-up state............................................................................. 11 REVISION HISTORY Rev Pr A5 Changed to 30V/60V mode ..............................................Universal Rev Pr A6 Removed mentions of AD5501 ...

Page 3

... V 0.8 V ±1 μ − 0 DGND +0 μ Rev Page AD5504 Test Conditions / Comments DAC-code = half scale R =60KΩ to AGND 60V mode 60V mode On any single channel On any single channel JEDEC compliant 5.5 V LOGIC ...

Page 4

... If the die temperature exceeds 130°C the AD5504 enters a temperature power-down mode putting the DAC outputs into a high impedance state thus removing the short circuit condition. Overheating caused by long term short circuit condition(s) is detected by an integrated thermal sensor. After power-down the AD5504 stays powered down until a software power-up command is executed ...

Page 5

... Power-on time. (not shown) ) and timed from a voltage level 200µ (MIN) – PIN C L 50pF 200µ Figure 2. Load Circuit for SDO Timing Diagram Rev Page unless otherwise noted. MAX + V )/ (MAX AD5504 ...

Page 6

... AD5504 t 10 SCLK t 8 SYNC R/W SDO 1 LDAC 2 LDAC CLR 3 ALARM 4 V OUTX 1 ASYNCHRONOUS LDAC UPDATE MODE 2 SYNCHRONOUS LDAC UPDATE MODE 3 IN THE EVENT OF OVER-TEMPERATURE CONDITION 4 V REFERS TO ANY OF V OUTX OUTA SCLK SYNC SDI A2 R/W SDO ...

Page 7

... THERMAL RESISTANCE -0 0.3 V LOGIC -0 0.3 V θ is specified for the worst-case conditions, that is, a device JA 150°C soldered in a circuit board for surface-mount packages. ESD CAUTION −65°C to +150°C 260°C 20 sec to 40 sec 112.60°C/W Rev Page AD5504 ...

Page 8

... V Logic Power Supply; 2 5.5 V. This pin should be decoupled with 0.1μF ceramic capacitors and 10 μF LOGIC capacitors. CLR LOGIC SYNC 2 15 ALARM SCLK AD5504 SDI R_SEL 4 13 SDO TOP VIEW OUTA (Not to Scale) DGND OUTB AGND V ...

Page 9

... Preliminary Technical Data TYPICAL PERFORMANCE CHARACTERISTICS Figure 6 Figure 7 Figure 8 Rev Page AD5504 Figure 9 Figure 10 ...

Page 10

... DAC register. Ideally, the output should The zero-code error is always positive in the AD5504, because the output of the DAC cannot go below due to a combination of the offset errors in the DAC and output amplifier. Zero-code error is expressed in millivolts. ...

Page 11

... The DAC output voltage range is selected via the range-select, R_SEL , pin. The DAC output range R_SEL is held high and R_SEL is held low. Data is written to the AD5504 in a 16-bit word format (see Table 7), via a serial interface. POWER-UP STATE On power-up, the Power-on-Reset circuitry clears the bits of the Control register (see Table ...

Page 12

... JA Absolute Maximum Ratings for this value). POWER SUPPLY SEQUENCING The power supplies for the AD5504 can be applied in any order without affecting the device. However, in order to ensure that the serial interface operates correctly after power up the digital input pins should not be allowed to float. Floating pins may be interpreted as SCLK, SDI or SYNC pulses by the AD5504 if they cross the switching thresholds of the digital input circuitry ...

Page 13

... DAC registers. In order to read back a register first necessary to tell the AD5504 that a readback is required. This is achieved by setting the R/ W bit to 1. The three address bits then determine the register from which data read back ...

Page 14

... Outputs are three-stated (If bits are set to 0 then the part is placed in power-down mode) INTERFACING EXAMPLES The SPI interface of the AD5504 is designed to allow the easily connected to industry-standard DSPs and microcontrollers. Figure 12 shows how the AD5504 can be connected to the Analog Devices, Inc., Blackfin® DSP. The Blackfin has an integrated ...

Page 15

... COMPLIANT TO JEDEC STANDARDS MO-153-AB Figure 14. 16-Lead Thin Shrink Small Outline Package [TSSOP] (RU-16) Dimensions shown in millimeters Package Description 16-Lead Thin Shrink Small Outline Package (TSSOP) 16-Lead Thin Shrink Small Outline Package (TSSOP) Rev Page 0.75 8° 0.60 0° 0.45 Package Option RU-16 RU-16 AD5504 ...

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