AD660BRZ Analog Devices Inc, AD660BRZ Datasheet - Page 16
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AD660BRZ
Manufacturer Part Number
AD660BRZ
Description
IC DAC 16BIT MONO W/VREF 24-SOIC
Manufacturer
Analog Devices Inc
Series
DACPORT®r
Datasheet
1.AD660ARZ.pdf
(20 pages)
Specifications of AD660BRZ
Data Interface
Serial
Settling Time
6µs
Number Of Bits
16
Number Of Converters
1
Voltage Supply Source
Analog and Digital, Dual ±
Power Dissipation (max)
625mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Resolution (bits)
16bit
Sampling Rate
167kSPS
Input Channel Type
Serial
Supply Voltage Range - Digital
4.5V To 5.5V
Supply Current
12mA
Digital Ic Case Style
SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD660BRZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
AD660
In applications such as waveform generation, accurate timing of
the output samples is important to avoid noise that is induced
by jitter on the LDAC signal. In this example, the ADSP-210x
is set up to use the internal timer to interrupt the processor at
the precise and desired sample rate. When the timer interrupt
occurs, the 16-bit data word of the processor is written to the
transmit register (TXn). This causes the DSP to automatically
generate the TFS signal and begin transmission of the data.
AD660 TO Z80 INTERFACE
Figure 20 shows a Zilog Z80 8-bit microprocessor connected to
the AD660 using the byte mode interface. The double-buffered
capability of the AD660 allows the microprocessor to indepen-
dently write to the low and high byte registers, and update the
DAC output. Processor speeds up to 6 MHz on the Z80 require
no extra wait states to interface with the AD660 when using a
74ALS138 as the address decoder.
The address decoder analyzes the input-output address produced
by the processor to select the function to be performed by the
AD660, qualified by the coincidence of the input/output request
( IORQ ) and write ( WR ) pins. The least significant address bit
(A0) determines if the low or high byte register of the AD660 is
active. More significant address bits select between input register
loading, DAC output update, and unipolar or bipolar clear.
A typical Z80 software routine begins by writing the low byte of
the desired 16-bit DAC data to Address 0, followed by the high
byte to Address 1. The DAC output is then updated by activating
LDAC with a write to Address 2 (or Address 3). A clear to unipolar
zero occurs on a write to Address 4, and a clear to bipolar zero
is performed by a write to Address 5. The actual data written to
Address 2 through Address 5 is irrelevant. The decoder can easily
be expanded to control as many AD660 devices as required.
A0 TO A15
D0 TO D7
Z80
IORQ
WR
ADSP-210x
Figure 20. Connections for 8-Bit Bus Interface
Figure 19. AD660 to ADSP-210x Interface
E2
E1
ADDRESS
A1 TO A15
DECODE
SCLK
TFS
DT
Y2
Y1
Y0
A0
74HC04
74HC74
D
Q
DB0 TO DB7
CLR
LDAC
CS
HBE
CS
DB0/DB8/SIN
SER
LDAC
LBE
AD660
SER
AD660
DGND
+V
LL
Rev. B | Page 16 of 20
NOISE
In high resolution systems, noise is often the limiting factor. A
16-bit DAC with a 10 V span has an LSB size of 153 μV (−96 dB).
Therefore, the noise floor must remain below this level in the
frequency range of interest. The noise spectral density of the
AD660 is shown in Figure 21 and Figure 22. Figure 21 shows
the DAC output noise voltage spectral density for a 20 V span
excluding the reference. This figure shows the 1/f corner frequency
at 100 Hz and the wideband noise to be below 120 nV/√Hz.
Figure 22 shows the reference noise voltage spectral density and
shows the reference wideband noise to be below 125 nV/√Hz.
100
100
1k
10
1k
10
1
1
1
1
Figure 21. DAC Output Noise Voltage Spectral Density
Figure 22. Reference Noise Voltage Spectral Density
10
10
100
100
FREQUENCY (Hz)
FREQUENCY (Hz)
1k
1k
10k
10k
100k
100k
1M
1M
10M
10M