AD8600 Analog Devices, AD8600 Datasheet

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AD8600

Manufacturer Part Number
AD8600
Description
16-Channel, 8-Bit Multiplying DAC
Manufacturer
Analog Devices
Datasheet

Specifications of AD8600

Resolution (bits)
8bit
Dac Update Rate
1MSPS
Dac Settling Time
1µs
Max Pos Supply (v)
+7V
Single-supply
Yes
Dac Type
Voltage Out
Dac Input Format
Par

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a
GENERAL DESCRIPTION
The AD8600 contains 16 independent voltage output digital-to-
analog converters that share a common external reference input
voltage. Each DAC has its own DAC register and input register
to allow double buffering. An 8-bit parallel data input, four ad-
dress pins, a CS select, a LD, EN, R/W, and RS provide the
digital interface.
The AD8600 is constructed in a monolithic CBCMOS process
which optimizes use of CMOS for logic and bipolar for speed
and precision. The digital-to-analog converter design uses volt-
age mode operation ideally suited to single supply operation.
The internal DAC voltage range is fixed at DACGND to V
The voltage buffers provide an output voltage range that ap-
proaches ground and extends to 1.0 V below V
reference voltage values and digital inputs will settle within
Data is preloaded into the input registers one at a time after the
internal address decoder selects the input register. In the write
mode (R/W low) data is latched into the input register during
the positive edge of the EN pulse. Pulses as short as 40 ns can
be used to load the data. After changes have been submitted to
the input registers, the DAC registers are simultaneously up-
dated by a common load EN
put voltages simultaneously appear on all 16 outputs.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
1 LSB in 2 s.
FEATURES
16 Independently Addressable Voltage Outputs
Full-Scale Set by External Reference
2 s Settling Time
Double Buffered 8-Bit Parallel Input
High Speed Data Load Rate
Data Readback
Operates from Single +5 V
Optional 6 V Supply Extends Output Range
APPLICATIONS
Phased Array Ultrasound & Sonar
Automatic Test Equipment
LCD Clock Level Setting
Power Level Setting
Receiver Gain Setting
LD strobe. The new analog out-
CC
. Changes in
REF
.
At system power up or during fault recovery the reset (RS) pin
forces all DAC registers into the zero state which places zero
volts at all DAC outputs.
The AD8600 is offered in the PLCC-44 package. The device is
designed and tested for operation over the extended industrial
temperature range of –40 C to +85 C.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
RS
DB7...DB0
R/W•CS•ADDR•EN
D
GND1
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
CS
EN
A3
A2
A1
A0
R/W•CS•ADDRESS
FUNCTIONAL BLOCK DIAGRAM
R/W
Figure 1. Equivalent DAC Channel
REGISTER
REGISTERS
CONTROL
ADDRESS
DECODE
INPUT
D
LOGIC
INPUT
16 x 8
GND1
RS
V
DD1
V
DD1
REGISTERS
LD
AD8600
16-Channel, 8-Bit
D
V
D
REGISTER
16 x 8
GND2
DAC
DD2
GND2
DAC
V
Multiplying DAC
DD2
LD•EN
RS
DACGND
V
REF
DACGND
DAC
8-BIT
AD8600
V
16
R-2R
DAC
REF
S
V
V
CC
EE
Fax: 617/326-8703
O0
O1
O2
O3
O4
O5
O6
O7
O8
O9
O10
O11
O12
O13
O14
O15
V
V
EE
CC
O
X

Related parts for AD8600

AD8600 Summary of contents

Page 1

... At system power up or during fault recovery the reset (RS) pin forces all DAC registers into the zero state which places zero volts at all DAC outputs. The AD8600 is offered in the PLCC-44 package. The device is designed and tested for operation over the extended industrial temperature range of – +85 C. ...

Page 2

... AD8600–SPECIFICATIONS SINGLE SUPPLY (@ DD1 DD2 Parameter Symbol 1 STATIC PERFORMANCE Resolution N 2 Relative Accuracy INL 2 Differential Nonlinearity DNL Full-Scale Voltage V FS Full-Scale Tempco TCV FS Zero Scale Error V ZSE V ZSE Reference Input Resistance R REF ANALOG OUTPUT 2 Output Voltage Range OVR SS Output Current ...

Page 3

... V, No Load – Load & pF DD1 DD2 –3– AD8600 +85 C, unless otherwise noted) A Min Typ Max 8 –1 3 –1 1/2 +1 –1 1/4 +1 3.473 3.486 3.500 – – – ...

Page 4

... AD8600 ELECTRICAL CHARACTERISTICS Parameter 1, 2 INTERFACE TIMING Clock (EN) Frequency Clock (EN) High Pulse Width Clock (EN) LowPulse Width Data Setup Time Data Hold Time Address Setup Time Address Hold Time Valid Address to Data Valid Load Enable Setup Time Load Enable Hold Time Read/Write to Clock (EN) ...

Page 5

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD8600 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 6

... AD8600 TRANSFER EQUATIONS Output Voltage V REF 256 where i is the DAC channel number and D is the decimal value of the DAC register data. Table I. Truth Table EN R Operation Write to DAC Register – Update DAC Register – H Update DAC Register ...

Page 7

... CODE = + GAIN 0 0 –45 –5 –90 –10 PHASE –15 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 11. Gain & Phase vs. Frequency REV. 0 Typical Performances Characteristics–AD8600 3. + – 3.5V REF 3.49 3.48 3.47 –50 – 100 125 TEMPERATURE – C Figure 6. Full-Scale Voltage vs. ...

Page 8

... For the tran- sistors used in the AD8600, this is approximately 40 mV. The AD8600 was not designed to swing to the positive rail in con- trast to some of ADI’s other DACs (for example, the AD8582). The output stage of the amplifier is actually capable of swinging to the positive rail, but the input stage limits this swing to ap- proximately 1 ...

Page 9

... V with reference ensure that the input logic levels do not change. Reference Input Considerations The AD8600 is designed for one reference to drive all 16 DACs. The reference pin (V ders of each DAC. With 16 DACs in parallel, the input imped- ance is typically 2 k and a minimum of 1 The input resistance is code dependent ...

Page 10

... N1, the other 15 channels are achieved. All of the logic for the AD8600 is level sensitive and not edge triggered. For example, if all the control inputs (CS, R/W, EN, LD) are low, the input and DAC registers are transparent and any change in the digital inputs will immediately change the DAC’ ...

Page 11

... Figure 21. Port C of the 68HC11 is used as a bidirectional input/output data port to write to and read from the AD8600. Port B is used for address- ing and control information. The bottom 4 LSBs of Port B are the address, and the top 4 MSBs are the control lines (LD, CS, EN, and R/W) ...

Page 12

... AD8600 * This program contains subroutines to read and write * to the AD8600 from the 68HC11. * program has been included, to continuously ramp the * output giving a triangle wave output The following connections need to be made: * 68HC11 AD8600 * GND DGND1,2 * PC0-PC7 DB0–DB7 respectively, data port ...

Page 13

... The AD600 requires a dc voltage to adjust its gain over range. Since dual, the two variable gain amplifiers can be cascaded to achieve gain. The AD8600 is used to generate a ramped output to control the gain of the AD600. The slope of the ramp should correspond to the time delay of the ultrasound signal ...

Page 14

... This point is the most demanding because all of the R-2R ladder switches are changing state. The AD8600’s glitch impulse is shown in Figure 25. Calculating the value of the glitch is accomplished by calculating the area of the pulse, which for the AD8600 is: Glitch Impulse = (1/2) (100 mV) (200 ns sec. V OUT ...

Page 15

... REV. 0 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). (P-44A) 0.180 (4.57) 0.165 (4.19) 0.048 (1.21) 0.056 (1.42) 0.042 (1.07) 0.042 (1.07 PIN 1 39 IDENTIFIER TOP VIEW 0.656 (16.66) SQ 0.650 (16.51) 0.110 (2.79) 0.695 (17.65) SQ 0.085 (2.16) 0.685 (17.40) –15– AD8600 0.025 (0.63) 0.015 (0.38) 0.021 (0.53) 0.013 (0.33) 0.63 (16.00) 0.59 (14.99) 0.032 (0.81) 0.026 (0.66) 0.050 (1.27) BSC 0.040 (1.01) 0.025 (0.64) ...

Page 16

... AD8600 –16– REV. 0 ...

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