DATASHEETS tdf8704 DATASHEETS (Philips)

INTEGRATED CIRCUITS
DATA SH EET
TDF8704
Product specification Supersedes data of April 1993 File under Integrated Circuits, IC02
Philips Semiconductors
June 1994
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
FEATURES
8-bit resolution
Sampling rate up to 50 MHz
Extended temperature range (40 to +85 °C)
High signal-to-noise ratio over a large analog input
frequency range (7.4 effective bits at 4.43 MHz full-scale input and at f
= 50 MHz)
clk
Binary 3-state TTL outputs
Overflow/underflow 3-state TTL output
TTL compatible digital inputs
Low-level AC clock input signal allowed
Stable internal reference voltage regulator included
Power dissipation only 380 mW (typical)
Low analog input capacitance, no buffer amplifier
required
No sample-and-hold circuit required.
QUICK REFERENCE DATA
APPLICATIONS
General purpose high-speed analog-to-digital conversion for extended temperature applications
Automotive
RF, satellite and GPS (Global Positioning System)
Medical
General industrial
Digital video (VCR, TV and satellite).
GENERAL DESCRIPTION
The TDF8704T is an 8-bit high-speed analog-to-digital converter (ADC) for general industrial applications. It converts the analog input signal into 8-bit binary-coded digital words at a maximum sampling rate of 50 MHz. All digital inputs and outputs are TTL compatible, although a low-level AC clock input signal is allowed.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V V V I
CCA
I
CCD
I
CCO
CCA CCD CCO
analog supply voltage 4.75 5.0 5.25 V digital supply voltage 4.75 5.0 5.25 V output stages supply voltage 4.75 5.0 5.25 V analog supply current 37 46 mA digital supply current 23 35 mA
output stages supply current 16 21 mA ILE DC integral linear error −±0.4 ±1 LSB DLE DC differential linearity error −±0.2 ±0.5 LSB AILE AC integral linearity error note 1 −−±2 LSB f
clk(max)
P
tot
maximum clock frequency 50 −−MHz
total power dissipation 380 535 mW
Note
1. Full-scale sine wave (f
= 4.43 MHz; f
i
= 50 MHz).
clk
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
PINS PIN POSITION MATERIAL CODE
SAMPLING
FREQUENCY
TDF8704T/2 24 SO24L plastic SOT137-1 20 MHz TDF8704T/4 24 SO24L plastic SOT137-1 40 MHz TDF8704T/5 24 SO24L plastic SOT137-1 50 MHz
June 1994 2
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
BLOCK DIAGRAM
handbook, full pagewidth
V
RT
V
RB
OGND
V
analog
voltage input
output ground
V
CCA
7
STABILIZER
5DEC
9
I
8
4
20
TDF8704
ANALOG - TO - DIGITAL
CONVERTER
6 AGND
17 DGND
CLK 16
CLOCK DRIVER
LATCHES
OVERFLOW / UNDERFLOW
LATCH
V
CCD
18
TTL OUTPUTS
TTL OUTPUT
CE
22
12 13 14 15 23 24 D2
19 21
11
MSA685
D7 D6 D5 D4 D3
1
D1
2
D0
MSB
data outputs
LSB
V
CCO1
V
CCO2
overflow / underflow
output
analog ground digital ground
Fig.1 Block diagram.
June 1994 3
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
PINNING
SYMBOL PIN DESCRIPTION
D1 1 data output; bit 1 D0 2 data output; bit 0 (LSB) n.c. 3 not connected V
RB
DEC 5 decoupling input (internal
AGND 6 analog ground V
CCA
V
I
V
RT
n.c. 10 not connected O/UF 11 overflow/underflow data output D7 12 data output; bit 7 (MSB) D6 13 data output; bit 6 D5 14 data output; bit 5 D4 15 data output; bit 4 CLK 16 clock input DGND 17 digital ground V
CCD
V
CCO1
OGND 20 output ground V
CCO2
CE 22 chip enable input (TTL level input,
D3 23 data output; bit 3 D2 24 data output; bit 2
4 reference voltage BOTTOM
(decoupling)
stabilization loop decoupling)
7 analog supply voltage (+5 V) 8 analog input voltage 9 reference voltage TOP (decoupling)
18 digital supply voltage (+5 V) 19 supply voltage for output stages 1
(+5 V)
21 supply voltage for output stages 2
(+5 V)
active LOW)
handbook, halfpage
1
D1
2
D0
3
n.c.
V
RB
4 5
DEC
AGND
6
V
CCA
V
O/UF
V
RT
n.c.
D7
TDF8704
7 8
I
9 10 11 12
MSA686
Fig.2 Pin configuration.
24
D2 D3
23 22
CE V
21
CCO2
OGND
20
V
CCO1
19
V
CCD
18 17
DGND
CLK
16
D4
15
D5
14
D6
13
June 1994 4
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
CCA
V
CCD
V
CCO
VVV
V
I
V
clk(p-p)
I
O
T
stg
T
amb
T
j
CC CC CC
analog supply voltage 0.3 +7.0 V digital supply voltage 0.3 +7.0 V output stages supply voltage 0.3 +7.0 V supply voltage differences between V supply voltage differences between V supply voltage differences between V
CCA CCO CCA
and V
and V
and V
CCD
CCD
CCO
1.0 +1.0 V
1.0 +1.0 V
1.0 +1.0 V
input voltage referenced to AGND 0.3 +7.0 V AC input voltage for switching (peak-to-peak value) referenced to DGND V
CCD
V output current 10 mA storage temperature 55 +150 °C operating ambient temperature 40 +85 °C junction temperature +150 °C
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is desirable to take normal precautions appropriate to handling integrated circuits.
THERMAL CHARACTERISTICS
SYMBOL PARAMETER VALUE UNIT
R
th j-a
thermal resistance from junction to ambient in free air 75 K/W
June 1994 5
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
CHARACTERISTICS (see Tables 1 and 2)
V
= V7 to V6 = 4.75 to 5.25 V; V
CCA
and DGND shorted together; V V
CCA
to V
= 0.25 to +0.25 V; T
CCD
CCA
unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Supply
V V V I
CCA
I
CCD
I
CCO
CCA CCD CCO
analog supply voltage 4.75 5.0 5.25 V digital supply voltage 4.75 5.0 5.25 V output stages supply voltage 4.75 5.0 5.25 V analog supply current 37 46 mA digital supply current 23 35 mA output stages supply current all outputs LOW 16 21 mA
Inputs
= V18to V17 = 4.75 to 5.25 V; V
CCD
to V
amb
= 0.25 to +0.25 V; V
CCD
= 40 to +85 °C; typical readings taken at V
CCO
CCO
to V
= V19and V21to V20 = 4.75 to 5.25 V; AGND
= 0.25 to +0.25 V;
CCD
CCA=VCCD
= 5 V and T
amb
=25°C;
LOCK INPUT CLK (REFERENCED TO DGND)
C V
IL
V
IH
I
IL
I
IH
Z
I
C
I
LOW level input voltage 0 0.8 V HIGH level input voltage 2.0 V LOW level input current V HIGH level input current V
input impedance f input capacitance f
= 0.4 V 400 −−µA
clk
= 2.7 V −−100 µA
clk
V
clk=VCCD
= 50 MHz 2 k
clk
= 50 MHz 4.5 pF
clk
−−300 µA
VI(ANALOG INPUT VOLTAGE REFERENCED TO AGDN; SEE FIGS 3 AND 4 AND TABLE 1) V
V V V V V V
I(B) I(0) os(B) I(T) I(255) os(T) I(p-p)
input voltage (BOTTOM) 1.21 1.25 1.29 V input voltage output code = 0 1.42 1.48 1.51 V offset voltage (BOTTOM) V
I(0)
to V
I(B)
210 225 240 V input voltage (TOP) 3.37 3.46 3.58 V input voltage output code = 255 3.14 3.22 3.30 V offset voltage (TOP) V input voltage amplitude
I(T)
to V
I(255)
225 240 255 V
1.69 1.74 1.79 V
(peak-to-peak value)
I
L
I
IL
I
IH
Z
I
C
I
load current on VRT and V
RB
LOW level input current VI = 1.25 V 0 −µA HIGH level input current VI = 3.46 V 40 150 400 µA input impedance fi = 4.43 MHz 10 k input capacitance fi = 4.43 MHz 14 pF
300 +300 µA
CCD
V
June 1994 6
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
INPUT CE (REFERENCED TO DGND) SEE TABLE 2 V
IL
V
IH
I
IL
I
IH
Reference resistance
R
ref
Outputs
D
IGITAL OUTPUTS D7 TO D0 (REFERENCED TO DGND)
V
OL
V
OH
I
OZ
LOW level input voltage 0 0.8 V HIGH level input voltage 2.0 V
CCD
V LOW level input current VIL = 0.4 V 400 −−µA HIGH level input current VIH = 2.7 V −−20 µA
reference resistance VRT to V
RB
LOW level output voltage IO = 1 mA;
T
= 0 to +85 °C
amb
= 1 mA;
I
O
T
=0to−40 °C
amb
HIGH level output voltage IO = 0.4 mA 2.7 V output current in 3-state
0.4 V < VO < V
CCD
200 −Ω
0 0.4 V
−−0.6 V
CCD
V
20 +20 µA
mode
Switching characteristics
C
LOCK INPUT CLK (NOTE 1; SEE FIG.15)
f
clk(max)
maximum clock frequency
TDF8704T/2 20 −−MHz TDF8704T/4 40 −−MHz TDF8704T/5 50 −−MHz
t
CPH
t
CPL
clock pulse width HIGH 7 −−ns clock pulse width LOW 7 −−ns
Analog signal processing
INEARITY
L ILE DC integral linearity error −±0.4 ±1.0 LSB
DLE DC differential linearity error −±0.2 ±0.5 LSB AILE AC integral linearity error note 2 −−±2.0 LSB
BANDWIDTH (f B −0.5 dB analog bandwidth
t
STLH
t
STHL
=40MHZ)
clk
(note 3) analog input settling time
LOW-to-HIGH analog input settling time
HIGH-to-LOW
full-scale sine wave 12 MHz 75% full-scale sine wave 16 MHz full-scale square wave;
2.5 3.5 ns
Fig.8; note 4 full-scale square wave;
3.0 4.0 ns
Fig.8; note 4
June 1994 7
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
HARMONICS (f h
1
=40MHZ)
clk
fundamental harmonics
fi = 4.43 MHz −−0dB
(full scale)
h
all
harmonics (full scale);
fi = 4.43 MHz
all components
second harmonics −−64 60 dB third harmonics −−58 55 dB
THD total harmonic distortion f
= 4.43 MHz −−56 dB
i
SIGNAL-TO-NOISE RATIO S/N signal-to-noise ratio without harmonics;
f
= 40 MHz;
clk
fi= 4.43 MHz EFFECTIVE BITS; NOTE 5; SEE FIGS 9, 10 AND 11 EB effective bits
TDF8704T/2 f
= 20 MHz
clk
= 1.25 MHz 7.8 bits
f
i
= 4.43 MHz 7.6 bits
f
i
effective bits
TDF8704T/4 f
= 40 MHz
clk
= 4.43 MHz 7.5 bits
f
i
= 7.5 MHz 7.3 bits
f
i
= 10 MHz 7.0 bits
f
i
effective bits
TDF8704T/5 f
= 50 MHz
clk
= 4.43 MHz 7.4 bits
f
i
= 7.5 MHz 7.2 bits
f
i
= 10 MHz 6.9 bits
f
i
TWO-TONE (NOTE 6) TTIR two-tone intermodulation
= 40 MHz −−56 dB
f
clk
rejection BIT ERROR RATE BER bit error rate f
= 40 MHz;
clk
fi= 4.43 MHz;
VI= ±16 LSB at code 128 DIFFERENTIAL GAIN (NOTE 7) G
diff
differential gain f
= 20 MHz;
clk
fi= 4.43 MHz DIFFERENTIAL PHASE (NOTE 7)
ϕ
diff
differential phase f
= 40 MHz;
clk
fi= 4.43 MHz
46 48 dB
10
11
times/
samples
0.6 %
0.8 deg
June 1994 8
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Timing (note 8; see Figs 5 and 7; f
t
ds
t
h
t
d
sampling delay time −−2ns output hold time 5 −−ns output delay time 12 15 ns
= 50 MHz)
clk
3-state output delay times (see Figs 6 and 7)
t
dZH
t
dZL
t
dHZ
t
dLZ
enable HIGH 610ns enable LOW 12 16 ns disable HIGH 50 54 ns disable LOW 10 14 ns
Notes
1. In addition to a good layout of the digital and analog ground, it is recommended that the rise and fall times of the clock must be less than 1 ns.
2. Full-scale sine wave (fi = 4.43 MHz; f
= 50 MHz).
clk
3. Determined by beat frequency method on a reconstructed sine wave signal for no missing codes and no glitches.
4. The analog input settling time is the minimum time required for the input signal to be stabilized after a sharp full-scale input (square-wave signal) in order to sample the signal and obtain correct output data.
5. Effective bits are obtained via a Fast Fourier Transform (FFT) treatment taking 4K acquisition points per period. The calculation takes into account all harmonics and noise up to half of the clock frequency (NYQUIST frequency). Conversion to signal-to-noise ratio: S/N = EB × 6.02 + 1.76 dB.
6. Intermodulation measured relative to either tone with analog input frequencies of 4.43 MHz and 4.53 MHz. The two input signals have the same amplitude and the total amplitude of both signals provides full scale to the converter.
7. Measurement taken using video analyser VM700A.
8. Output data acquisition: the output data is available after the maximum delay time of td.
MBD868
I(B)
o
under
1.29
V
(V)
1.27
1.25
1.23
I (B)
3.49
handbook, halfpage
V
I (T)
(V)
3.47
3.45
3.43 60
Fig.3 Influence of T
0.1 mV/K
V
I (T)
0.05 mV/K
V
I (B)
20 20 60 100
on V
amb
I(T)
T ( C)
amb
and V
5 V supply.
June 1994 9
3.44
ndbook, halfpage
V
I (T)
(V)
3.42
V
I (T)
3.40
3.38
4.25 4.75 5.75
V
I (B)
5.25
Fig.4 Influence of supply voltage on V
V
under T
I(B)
= 25 °C.
amb
17 mV/V
7 mV/V
V (V)
CC
MSA689
I(T)
1.28
V
1.26
1.24
1.22
and
I (B)
(V)
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
Table 1 Output coding and input voltage (typical values; referenced to AGND).
STEP V
I(p-p)
O/UF
D7 D6 D5 D4 D3 D2 D1 D0
Underflow <1.48 1 1 0000000 0 1.48 0 0 0000000 1 000000001
. . .. ......
. . .........
254 . 011111110 255 3.46 0 1 1111111 Overflow >3.46 1 1 1111111
Table 2 Mode selection.
CE D7 TO D0 O/UF
1 high impedance high impedance 0 active; binary active
t
BINARY OUTPUT BITS
handbook, full pagewidth
t
CPL
CPH
CLK
V
l
DATA D0 to D7
DATA
N 2
sample N
t
ds
DATA
N 1
t
d
sample N 1
t
h
DATA
N
Fig.5 Timing diagram for data output.
sample N 2
N
DATA
N 1
1.4 V
2.4 V
1.4 V
0.4 V
MSA688 - 1
June 1994 10
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
V
CE
CCD
50 %
handbook, full pagewidth
fCE= 100kHz.
LOW
V
S1
CCD
t
dZH
t t t t
MLB880
50 %
TEST S1
dLZ dZL dHZ dZH
output data
output data
LOW
t
dLZ
10 %
TDF8704
CE
HIGH
t
dHZ
HIGH
t
dZL
50 %
3.3 k
15 pF
90 %
Fig.6 Timing diagram and test conditions of 3-state output delay time.
V
CCD
V
CCD
GND GND
handbook, halfpage
Fig.7 Load circuit for timing measurement.
June 1994 11
D0 to D7
15 pF
MBB956 - 1
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
handbook, full pagewidth
amplitude
(dB)
0
20
handbook, full pagewidth
t
STLH
code 255
V
50 %
I
code 0
2 ns
CLK
MBD869
50 %
0.5 ns
Fig.8 Analog input settling-time diagram.
2 ns
t
STHL
50 %
50 %
0.5 ns
MBD870
40
60
80
100
120
0 1.25 2.49
Effective bits: 7.89; THD = 61.05dB. Harmonic levels (dB): 2nd =84.07; 3rd = 62.50; 4th = 92.01; 5th = 66.56; 6th = 101.15.
Fig.9 Fast Fourier Transform (f
3.74
= 20 MHz; fi= 1.25 MHz).
clk
June 1994 12
8.724.98 6.23 7.47 9.96 f (MHz)
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
handbook, full pagewidth
0
amplitude
(dB)
20
40
60
80
100
120
0 2.48 4.96
Effective bits: 7.61; THD = 57.11 dB. Harmonic levels (dB): 2nd = 68.53; 3rd = 58.36; 4th = 74.89; 5th = 65.37; 6th = 76.08.
Fig.10 Fast Fourier Transform (f
7.44
= 40 MHz; fi= 4.43 MHz).
clk
MBD871
17.49.93 12.4 14.9 19.9
f (MHz)
handbook, full pagewidth
0
amplitude
(dB)
20
40
60
80
100
120
0 3.12 6.24
Effective bits: 6.91; THD = 46.13 dB. Harmonic levels (dB): 2nd = 59.66; 3rd = 46.67; 4th = 70.80; 5th = 57.96; 6th = 72.16.
Fig.11 Fast Fourier Transform (f
9.35
= 50 MHz; fi= 10 MHz).
clk
MBD872
21.812.5 15.6 18.7 24.9
f (MHz)
June 1994 13
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
INTERNAL PIN CONFIGURATIONS
V
handbook, halfpage
V
CCO2
CCO1
handbook, halfpage
V
CCA
D7 to D0
O/UF
DGND
MLB036
Fig.12 TTL data and overflow/underflow outputs.
ook, halfpage
V
CCO1
V
AGND
(x 90)
I
MLB037
Fig.13 Analog inputs.
CE
DGND
Fig.14 CE (3-state) input.
June 1994 14
MLB038
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
handbook, full pagewidth
V
CCA
DEC
AGND
Fig.15 V
RB, VRT
and DEC.
MSA687
V
RT
V
RB
V
handbook, full pagewidth
CCD
CLK
30 k 30 k
DGND
Fig.16 CLK input.
June 1994 15
MCD189 - 1
V
ref
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
APPLICATION INFORMATION
handbook, halfpage
47 pF
AGND
AGND
AGND
10 nF
100 nF
1
D1 D2
2
D0
(2)
n.c.
3
(1)
V
4
RB
DEC
5
6
AGND
V
CCA
V
RT
n.c.
O / UF
D7
V
I
(1)
(2)
TDF8704
7
8
9
10
11
12
24
D3
23
CE
22
V
CCO2
21
OGND
20
V
CCO1
19
V
CCD
18
DGND
17
CLK
16
D4
15
D5
14
D6
13
MSA684
The analog and digital supplies should be separated and decoupled. (1) VRB and VRT are decoupling pins for the internal reference ladder; do not draw current from these pins in order to achieve good linearity. (2) Pins 3 and 10 should be connected to DGND in order to prevent noise influence.
Fig.17 Application diagram.
June 1994 16
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
PACKAGE OUTLINE
handbook, full pagewidth
S
pin 1
index
112
0.9
0.4
(4x)
15.6
15.2
1.27
0.49
0.36
0.1 S
1324
0.25 M
(24x)
2.45
2.25
0.3
0.1
10.65
10.00
detail A
7.6
7.4
1.1
0.5
1.1
1.0
0.32
0.23
o
0 to 8
MBC235 - 1
A
2.65
2.35
Dimensions in mm.
June 1994 17
Fig.18 Plastic small outline package; 24 leads; large body; SOT137-1.
Philips Semiconductors Product specification
8-bit high-speed analog-to-digital converter TDF8704
SOLDERING Plastic small-outline packages
YWAVE
B During placement and before soldering, the component
must be fixed with a droplet of adhesive. After curing the adhesive, the component can be soldered. The adhesive can be applied by screen printing, pin transfer or syringe dispensing.
Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder bath is 10 s, if allowed to cool to less than 150 °C within 6 s. Typical dwell time is 4 s at 250 °C.
A modified wave soldering technique is recommended using two solder waves (dual-wave), in which a turbulent wave with high upward pressure is followed by a smooth laminar wave. Using a mildly-activated flux eliminates the need for removal of corrosive residues in most applications.
Y SOLDER PASTE REFLOW
B Reflow soldering requires the solder paste (a suspension
of fine solder particles, flux and binding agent) to be
applied to the substrate by screen printing, stencilling or pressure-syringe dispensing before device placement.
Several techniques exist for reflowing; for example, thermal conduction by heated belt, infrared, and vapour-phase reflow. Dwell times vary between 50 and 300 s according to method. Typical reflow temperatures range from 215 to 250 °C.
Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 min at 45 °C.
EPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING
R
IRON OR PULSE
-HEATED SOLDER TOOL)
Fix the component by first soldering two, diagonally opposite, end pins. Apply the heating tool to the flat part of the pin only. Contact time must be limited to 10 s at up to 300 °C. When using proper tools, all other pins can be soldered in one operation within 2 to 5 s at between 270 and 320 °C. (Pulse-heated soldering is not recommended for SO packages.)
For pulse-heated solder tool (resistance) soldering of VSO packages, solder is applied to the substrate by dipping or by an extra thick tin/lead plating before package placement.
DEFINITIONS
Data sheet status
Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.
June 1994 18
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