INTERSIL HI5780

10-Bit, 80 MSPS, High Speed,
Low Power D/A Converter
August 1997
Features
Description
• Throughput Rate . . . . . . . . . . . . . . . . . . . . . . . 80 MSPS
The HI5780 is a 10-bit, 80 MSPS, high speed, low power
CMOS D/A converter. The converter incorporates a 10-bit input
data register with current outputs. The HI5780 includes a power
down feature that reduces power consumption and a blanking
control. The on-chip bandgap reference can be used to set the
output current range of the D/A.
• Low Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150mW
• Differential Linearity Error . . . . . . . . . . . . . . . ±0.5 LSB
• TTL/CMOS Compatible Inputs
• Built in Bandgap Voltage Reference
Ordering Information
• Power Down and Blanking Control Pins
PART
NUMBER
• Direct Replacement for Sony CXD2306
TEMP.
RANGE (oC)
PACKAGE
PKG. NO.
Q32.7x7-S
Applications
HI5780JCQ
-20 to 75
32 Ld MQFP
• Wireless Communications
HI5780-EV
25
Evaluation Kit
• Direct Digital Frequency Synthesis
• Signal Reconstruction
• Test Equipment
• High Resolution Imaging and Graphics Systems
• Arbitrary Waveform Generators
Pinout
AGND
NC
DGND
DVDD
NC
D0 (LSB)
D1
D2
HI5780
(MQFP)
23
IOUT
3
22
VG
D6
4
21
AVDD
D7
5
20
AVDD
D8
6
19
VREF
D9 (MSB)
7
18
REFOUT
NC
8
17
9 10 11 12 13 14 15 16
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
10-1716
IREF
NC
DGND
2
D5
VB
D4
DVDD
IOUT
NC
32 31 30 29 28 27 26 25
24
PD
1
BLK
D3
CLK
[ /Title
(HI578
0)
/Subject
(10Bit, 80
MSPS,
High
Speed,
Low
Power
D/A
Converter)
/Autho
r ()
/Keywords
(Intersil
Corporation,
Semiconductor
Communications
Division,
Intersil
Semiconductor,
CommLink,
HI5780
File Number
4024.4
HI5780
Typical Application Circuit
+5V
+5V
HI5780
0.01µF
0.01µF
(20, 21) AVDD
DVDD (13, 28)
D9
0.1µF
D9 (MSB) (7)
(22) VG
D8
D8 (6)
D7
D7 (5)
(18) REFOUT
D6
D6 (4)
(19) VREF
D5
D5 (3)
D4
D4 (2)
D3
D3 (1)
D2
D2 (32)
D1
D1 (31)
D0
D0 (30)
0.1µF
(14) VB
D/A OUT
(24) IOUT
200Ω
(23) IOUT
CLK (9)
(17) IREF
BLK (10)
50Ω
2.0kΩ
DGND (8, 12,15, 16,
26, 27, 29)
(25) AGND
PD (11)
POWER DOWN CONTROL
Functional Block Diagram
IOUT
(LSB) D0
D1
4 LSB
D2
CURRENT
CELLS
D3
D4
D5
DECODER
D6
6 MSB
CURRENT
CELLS
D7
D8
IOUT
DATA
REGISTER
VG
DECODER
(MSB) D9
CURRENT CELLS
(FOR FULL SCALE)
BLK
CLK
CLOCK
GENERATOR
-
+
VREF
IREF
BIAS VOLTAGE
GENERATOR
VB
BANDGAP
VOLTAGE
REFERENCE
PD
10-1717
REFOUT
HI5780
Absolute Maximum Ratings
Thermal Information
Supply Voltage VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . +7.0V
Digital Input Voltages (D9-D0, CLK, BLANK, PD) . . . . VDD to -0.5V
Internal Reference Output Current . . . . . . . . . . . . . . . . . . . . ±2.5mA
Reference Input Voltage Range (VREF) . . . . . . . . . . . . VDD to -0.5 V
Analog Output Current (IOUT) . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Thermal Resistance (Typical, Note 1)
θJA (oC/W)
MQFP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .
122
Maximum Junction Temperature (Plastic Package)
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
(MQFP - Lead Tips Only)
Operating Conditions
Temperature Range, HI5780BIx . . . . . . . . . . . . . . . . . -20oC to 75oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
AVDD , DVDD = 5.00V, VREF = 2.0V, fCLK = 80 MSPS, RLOAD = 200Ω, RREF = 3.3kΩ,
TA = 25oC
HI5780JCQ
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
10
-
-
Bits
SYSTEM PERFORMANCE
Resolution
Integral Linearity Error, INL
(Notes 4, 5) (“Best Fit” Straight Line)
-2.0
1.25
2.0
LSB
Differential Linearity Error, DNL
(Notes 4, 5)
-0.5
0.25
0.5
LSB
Offset Error, IOS
(Notes 4, 5)
-
-
5
µA
Full Scale Output Current, IFS
(Note 4)
9.0
9.6
10
mA
Full Scale Drift Coefficient, IDRIFT
(Note 2)
-
0.26
-
mV/oC
Output Voltage Compliance Range
(Note 3), 10-Bit Accuracy
1.8
1.92
2.0
V
Throughput Rate
(Note 3)
80.0
-
-
MSPS
Output Voltage Full Scale Step
Settling Time, tSETT FS
To ±0.5 LSB Error Band RL = 75Ω, 10-Bit Accuracy
(Note 3)
-
6.0
-
ns
Singlet Glitch Area, GE (Peak)
RLOAD = 75Ω, VOUT = 1.0VP-P (Note 3)
-
40
-
pV-s
Differential Gain, DG
(Note 4)
-
2.5
-
%
Differential Phase, DP
(Note 4)
-
1.3
-
Degrees
Spurious Free Dynamic Range,
SFDR to Nyquist
fCLK = 40 MSPS, fOUT = 2.02MHz, 20MHz Span
(Note 3)
-
48.5
-
dBc
fCLK = 80 MSPS, fOUT = 2.02MHz, 40MHz Span
(Note 3)
-
47.5
-
dBc
fCLK = 40 MSPS, fOUT = 10MHz, 20MHz Span (Note 3)
-
40.75
-
dBc
fCLK = 80 MSPS, fOUT = 20MHz, 40MHz Span (Note 3)
-
38.5
-
dBc
fCLK = 40 MSPS, fOUT = 2.02MHz, 2MHz Span (Note 3)
-
75.0
-
dBc
fCLK = 80 MSPS, fOUT = 2.02MHz, 2MHz Span (Note 3)
-
73.5
-
dBc
fCLK = 40 MSPS, fOUT = 10MHz, 2MHz Span (Note 3)
-
56.5
-
dBc
fCLK = 80 MSPS, fOUT = 20MHz, 2MHz Span (Note 3)
-
49.0
-
dBc
1.0
1.25
1.3
V
DYNAMIC CHARACTERISTICS
Spurious Free Dynamic Range, SFDR Within
a Window
REFERENCE
Internal Reference Voltage, REFOUT
(Notes 4, 5)
Internal Reference Voltage Drift
(Note 3)
-
0.34
-
mV/oC
Reference Input Voltage Range, VREF
(Note 3)
0.5
-
2.0
V
10-1718
HI5780
Electrical Specifications
AVDD , DVDD = 5.00V, VREF = 2.0V, fCLK = 80 MSPS, RLOAD = 200Ω, RREF = 3.3kΩ,
TA = 25oC (Continued)
HI5780JCQ
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS (D9-D0, CLK, BLK, PD)
Input Logic High Voltage, VIH
(Note 5)
2.15
-
-
V
Input Logic Low Voltage, VIL
(Note 5)
-
-
0.85
V
Input Logic Current, IIH
(Note 5)
-
-
5
µA
Input Logic Current, IIL
(Note 5)
-5
-
-
µA
Digital Input Capacitance, CIN
(Note 3)
-
3.0
-
pF
TIMING CHARACTERISTICS
Data Setup Time, tSU
(See Figure 1, Note 3)
5.0
3.0
-
ns
Data Hold Time, tHLD
(See Figure 1, Note 3)
1.0
0
-
ns
Propagation Delay Time, tPD
(See Figure 1, Note 3)
-
8.0
-
ns
CLK Pulse Width, tPW1 , tPW2
(See Figure 1, Note 3)
6.25
-
-
ns
POWER SUPPLY CHARACTERISTICS
IVDD
(Notes 4, 5)
-
20
30
mA
Power Dissipation
(Note 5)
-
100
150
mW
Sleep Mode Power Consumption
PD = 1 (Note 4)
-
1.25
-
mW
NOTES:
2. RLOAD is connected to IOUT (pin 24) and RREF is connected to IREF (pin 17).
3. Parameter guaranteed by design or characterization and not production tested.
4. Typical values are test results at TA = 25oC.
5. All devices are 100% tested at 25oC.
Timing Diagrams
50%
CLK
D9-D0
1/
2
LSB ERROR BAND
GLITCH AREA = 1/2 (H x W)
V
HEIGHT (H)
IOUT
tPD
tSETT
FIGURE 1. FULL SCALE SETTLING TIME DIAGRAM
WIDTH (W)
t(ps)
FIGURE 2. PEAK GLITCH AREA (SINGLET) MEASUREMENT
METHOD
10-1719
HI5780
Timing Diagrams (Continued)
tPW1
tPW2
50%
CLK
tSU
tSU
tSU
tHLD
tHLD
tHLD
D9-D0
tSETT
tPD
1
/2 LSB
CHANGE
IOUT
1/
2 LSB
CHANGE
tPD
tSETT
tPD
tSETT
FIGURE 3. PROPAGATION DELAY, SETUP TIME AND MINIMUM PULSE WIDTH DIAGRAM
Pin Descriptions
PIN
PIN NAME
DESCRIPTION
1-7, 30-32
D0 (LSB) thru
D9 (MSB)
9
CLK
Data Clock Pin 100kHz to 80MHz.
13, 28
DVDD
Digital Logic Supply +5V.
15, 27
DGND
Digital Ground.
20, 21
AVDD
Analog Supply +5V.
23
BLK
Output Blanking pin. When set (‘1’) this pin zeros the IOUT pin.
25
AGND
11
PD
Power Down Mode pin. This pin when set (‘1’) places the HI5780 in lower power mode and zeros the
output. Power consumption is reduced.
24
IOUT
Current Output pin.
23
IOUT
Complementary Current Output pin.
18
REFOUT
Bandgap Reference Voltage Output.
17
IREF
Reference Current setting resistor connected from here to Ground.
19
VREF
Reference Voltage Input pin.
14
VB
Bias Voltage Generator Bypass Capacitor connected from here to Ground.
22
VG
Reference Amplifier Bypass Capacitor connected from here to AVDD .
Digital Data Bit 0, the least significant bit thru digital data Bit 9, the most significant bit.
Analog Ground Supply Current Return pin.
10-1720
HI5780
1.0
2.0
0.75
1.5
0.5
1.0
0.25
0.5
LSB
LSB
Typical Performance Curves
0
0
-0.25
-0.5
-0.5
-1.0
-0.75
-1.5
-2.0
-1.0
0
100
200
300
400
500
600
700
800
900 1000
0
100
200
300
400
500
CODE
FIGURE 4. DIFFERENTIAL LINEARITY
700
800
900 1000
FIGURE 5. INTEGRAL LINEARITY (BEST FIT - STRAIGHT LINE)
23
-10
mA
600
CODE
22
-20
21
-30
20
-40
S
-50
19
ATTEN 10dB
RL -10.0dBm
∆MKR -48.50dB
2.00MHz
10dB/
HI5780
fS = 40 MSPS
fO = 2MHz
-60
-70
18
-80
17
-90
16
-100
15
10
20
30
40
50
60
70
80
90
START 0Hz
RBW 1.0kHz
100
MHz
FIGURE 6. POWER SUPPLY CURRENT vs CLOCK FREQUENCY
ATTEN 10dB
RL -10.0dBm
VBW 1.0kHz
FIGURE 7. SPURIOUS FREE DYNAMIC RANGE TO NYQUIST
∆MKR -75.00dB
33kHz
10dB/
HI5780
fS = 40 MSPS
fO = 2MHz
S
CENTER 2.000MHz
RBW 300Hz
STOP 20.00MHz
SWP 50.0s
VBW 300Hz
SPAN 2.000MHz
SWP 56.0s
FIGURE 8. SPURIOUS FREE DYNAMIC RANGE WITHIN A WINDOW
10-1721
HI5780
Detailed Description
Reference
The HI5780 is a 10-bit, current out D/A converter. The DAC
can convert at 80 MSPS and runs on +5V supplies. The
HI5780 achieves its low power and high speed performance
from an advanced CMOS process. The HI5780 consumes
150mW (Maximum) and has a power down mode that only
consumes 1.25mW when in sleep mode. The HI5780 is an
excellent converter to be used for communications applications and high performance video systems.
The internal reference in the HI5780 is a 1.25V (typical)
bandgap voltage reference. The internal reference is buffered by an amplifier to provide adequate drive for the current
cells. Reference Out (REFOUT) is connected to the VREF pin.
The Full Scale Output Current is controlled by the resistor
connected to IREF . The full scale output voltage, is set by the
following equation:
VO UT (Full Scale) = V REF x 16 ( R LOAD /R REF ).
Digital Inputs
The HI5780 is a TTL/CMOS-compatible D/A. Data is latched
by a 10-bit latch. Once latched data inputs D0 (LSB) thru D9
(MSB) are decoded to the internal current cells; the internal
latch and switching current source controls are implemented
in CMOS technology to maintain high switching speeds and
low power consumption.
Clocks and Termination
Applications
Voltage Conversion of the Output
To convert the output current of the D/A converter to a
voltage, an amplifier should be used as shown in Figure 5.
The DAC needs a 50Ω termination resistor on the IOUT pin to
ensure proper settling. The HFA1110 has an internal feedback resistor to compensate for high frequency operation.
The internal 10-bit register is updated on the rising edge of
the clock. Since the HI5780 clock rate can run to 80MHz, to
minimize reflections and clock noise into the part, proper termination should be used. In PCB layout clock runs should be
kept short and have a minimum of loads. To guarantee consistent results from board to board, controlled impedance
PCBs should be used with a characteristic line impedance,
ZO , of 50Ω .
+5V
2
1
HFA1110
HI5780
DAC
IOUT
21
50Ω
To terminate the clock line a shunt terminator to ground is the
most effective type at a 80 MSPS clock rate. A typical value
for termination can be determined by the equation:
8
+
4
5
6
50Ω
-5.2V
FIGURE 10. HIGH SPEED CURRENT TO VOLTAGE CONVERSION
RT = Z O ,
for the termination resistor. For a controlled impedance
board with a ZO of 50Ω, the RT = 50Ω. Shunt termination is
best used at the receiving end of the transmission line or as
close to the HI5780 CLK pin as possible.
Integral Linearity Error, INL, is the measure of the worst
case point that deviates from a best fit straight line of data
values along the transfer curve.
Differential Linearity Error, DNL, is the measure of the
step size output deviation from code to code. Ideally the step
size should be 1 LSB. A DNL specification of 1 LSB or less
guarantees monotonicity.
HI5780
DAC
ZO = 50Ω
Definition of Specifications
CLK
RT = 50Ω
Output Voltage Full Scale Settling Time, is the time
required from the 50% point on the clock input for a full scale
step to settle within an 1/2 LSB error band.
FIGURE 9. AC TERMINATION OF THE HI5780 CLOCK LINE
Rise and Fall times and propagation delay of the line will be
affected by the Shunt Terminator. The terminator can be
connected to DGND.
Noise Reduction
To reduce power supply noise, separate analog and digital
power supplies should be used with 0.1µF and 0.01µF
ceramic capacitors placed as close to the body of the
HI5780 as possible on the analog (AVDD) and digital (DVDD)
supplies. The analog and digital ground returns should be
connected together back at the device to ensure proper
operation on power up.
Glitch Area, GE, is the switching transient appearing on the
output during a code transition. It is measured as the area
under the curve and expressed as a Volt-Time specification.
Differential Gain, ∆AV , is the gain error from an ideal sine
wave with a normalized amplitude.
Differential Phase, ∆Φ, is the phase error from and ideal
sine wave.
Spurious Free Dynamic Range, SFDR, is the amplitude
difference from a fundamental to the largest harmonically or
non-harmonically related spur. A sine wave is loaded into the
D/A and the output filtered at 1/2 the clock frequency to eliminate noise from clocking alias terms.
10-1722
HI5780
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries 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 Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
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NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (407) 724-7000
FAX: (407) 724-7240
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Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
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Taiwan Limited
7F-6, No. 101 Fu Hsing North Road
Taipei, Taiwan
Republic of China
TEL: (886) 2 2716 9310
FAX: (886) 2 2715 3029
Spec Number
10-1723