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REV: 072403
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here:
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.
GENERAL DESCRIPTION
The DS4000 digitally controlled temperature-compen-
sated crystal oscillator (DC-TCXO) features a digital
temperature sensor, one fixed-frequency temperature-
compensated square-wave output (F
1
), one
programmable temperature-compensated square-
wave output (F
2
), and digital communication for
frequency tuning (SDA, SCL).
APPLICATIONS
Reference Oscillators in PLL Circuits
Global Positioning Systems
SATCOM
Telecom
Wireless Base Stations
ORDERING INFORMATION
PART TEMP
RANGE
PIN-PACKAGE
DS4000
0C to +70C
24 BGA
DS4000N
-40C to +85C
24 BGA
Selector Guide appears end of data sheet.
FEATURES
Aging 1.0ppm (First Year)
Frequency Stability 1.0ppm from -40C to +85C
Frequency Versus Supply Stability of 1.0ppm per
Volt
Base Frequency is Digitally Tunable by 10ppm
One Fixed-Frequency Output and One
(n + 1) or 2(n + 1) Division of the Base
Frequency Output
Temperature Measurements from -40C to +85C
with 10-Bit/+0.25C Resolution and 3C
Accuracy
2-Wire Serial Interface
PIN CONFIGURATION
DS4000
Digitally Controlled TCXO
www.maxim-ic.com
TOP VIEW
BGA
6
5
4
3
2
1
SCL
SDA
A0
GND
OSC
N.C.
GND
F2
V
CC
F1
V
OSC
GND
GND
A
B
C
D
DS4000 Digitally Controlled TCXO
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ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground
-0.3V to +6.0V
Storage Temperature Range
-55C to +85C
Operating Voltage Range
V
CC
= 5V 5%
Operating Temperature Range
Commercial
0C to +70C
Industrial
-40C to +85C
Soldering Temperature
See IPC/JEDEC J-STD-020A (2x max)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods can affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= 5V 5%, over the operating temperature range.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
CC
(Notes
1,
2)
4.75 5.0 5.25 V
Oscillator Supply Voltage
V
OSC
(Notes
1,
2)
4.75 5.0 5.25 V
Input Logic High
V
IH
(Note
1)
2.2
V
CC
+ 0.3
V
Input Logic Low
V
IL
(Note
1)
-0.3 +0.8 V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V 5%, over the operating temperature range.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Active Supply Current
I
CC
(Notes
3,
4)
1.5 2 mA
Active Oscillator Supply Current
I
OSC
(Notes
3,
4)
3.5 5.5 mA
Output Logic High 2.4V
I
OH
(Note
1)
-1
mA
Output Logic Low 0.4V
I
OL
(Note
1)
4 mA
Input Leakage
I
LI
1
mA
I/O Leakage
I
LO
1
mA
Temperature Conversion Time
t
CONVT
(Note
3)
250 300 ms
Note 1: All voltages are referenced to ground.
Note 2: For 10% operating range, contact factory.
Note 3: Typical values are at +25
C and nominal supplies.
Note 4: These parameters are measured with the outputs disabled.
DS4000 Digitally Controlled TCXO
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AC ELECTRICAL CHARACTERISTICS: TCXO
(V
CC
= 5V 5%, over the operating temperature range.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
F
1
Output Frequency
F
2
CMOS (Note 5)
10
20
MHz
Frequency Stability vs.
Temperature
DF/T
A
-1.0
+1.0
ppm
Frequency Stability vs. Voltage
DF/V
(Note
6)
1.0 ppm/V
Frequency Stability vs. Aging
DF/Yr
1.0 ppm/Yr
F
1
, F
2
Rise and Fall Time, 10% to
90%
t
R
, t
F
4
ns
Max Output Capacitive Load
C
L
10 pF
Duty Cycle
t
W
/ t
40
50
60
%
10Hz
-85
100Hz
-115
1kHz
-129
10kHz
-134
Phase Noise f1 Output (Note 7)
f
N
100kHz
-139
dBc/Hz
Note 5: F
1
is the base frequency as defined by the package markings. F
2
is a programmable frequency output. The output frequency of F
2
is
derived from the base frequency, F
1
, by programming the F
2
frequency select register and duty cycle (DC) bit in the TCXO control
register. The minimum output frequency is F
1
/ (2
8
+ 1) with DC = 0 and f
1
/ [2 x (2
8
+ 1)] with DC = 1.
Note 6: First year typical.
Note 7: 16.384MHz, 5V, +25C with one of the two outputs enabled.
DS4000 Digitally Controlled TCXO
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AC ELECTRICAL CHARACTERISTICS--2-WIRE SERIAL INTERFACE
(V
CC
= 4.75 to 5.25V, T
A
= -40
C to +85C)
PARAMETER SYMBOL CONDITION
MIN
TYP
MAX
UNITS
Fast mode
0
400
SCL Clock Frequency
f
SCL
Standard mode
0
100
kHz
Fast mode
1.3
Bus Free Time Between
a STOP and START
Condition
t
BUF
Standard mode
4.7
ms
Fast mode (Note 7)
0.6
Hold Time (Repeated)
START Condition
t
HD:STA
Standard mode (Note 7)
4.0
ms
Fast mode
1.3
Low Period of SCL
Clock
t
LOW
Standard mode
4.7
ms
Fast mode
0.6
High Period of SCL
Clock
t
HIGH
Standard mode
4.0
ms
Fast mode
0.6
Setup Time for a
Repeated START
Condition
t
SU:STA
Standard mode
4.7
ms
Fast mode (Note 8)
0
0.9
Data Hold Time
t
HD:DAT
Standard mode (Note 8)
0
0.9
ms
Fast mode (Note 9)
100
Data Setup Time
t
SU:DAT
Standard mode (Note 9)
250
ns
Fast mode (Note 9)
20 + 0.1C
B
300
Rise Time of Both SDA
and SCL
t
R
Standard mode (Note 9)
20 + 0.1C
B
1000
ns
Fast mode (Note 10)
20 + 0.1C
B
300
Fall Time of Both SDA
and SCL
t
F
Standard mode (Note 10)
20 + 0.1C
B
1000
ns
Fast mode
0.6
Setup Time for STOP
Condition
t
SU:STO
Standard mode
4.0
ms
Capacitive Load for
Each Bus Line
C
B
(Note 10)
400
pF
Input Capacitance
C
I
5
pF
Note 7: After this period, the first clock pulse is generated.
Note 8: The maximum t
HD:DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
Note 9: A fast-mode device can be used in a standard mode system, but the requirement t
SU:DAT
>250ns must then be met. This is automatically
the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL
signal, it must output the next data bit to the SDA line t
RMAX
+ t
SU:DAT
(1000 + 250 = 1250ns) before the SCL line is released.
Note 10: C
B
: Total capacitance of one bus line in pF.
DS4000 Digitally Controlled TCXO
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Figure 1. Timing Diagram
PIN DESCRIPTION
PIN NAME
FUNCTION
1A, 1B, 1C,
1D, 2C, 2D
GND
Ground. DC power is provided to the device on these pins.
2A, 2B
N.C.
No Connection. (Do not connect to ground.)
3A, 3B
GND
OSC
Oscillator Ground. DC power is provided to the oscillator on these pins.
3C, 3D
V
OSC
Oscillator Power Supply. DC power is provided to the oscillator on these pins.
4A, 4B
A
0
2-Wire Slave Address Input. This pin is used to configure the slave address.
4C, 4D
F
1
DC-TCXO Frequency Output
5A, 5B
SDA
2-Wire Serial-Data Input/Output. SDA is the input/output pin for the 2-wire serial
interface. The SDA pin is open drain and requires an external pullup resistor.
5C, 5D
V
CC
Power Supply. DC power is provided to the device on these pins.
6A, 6B
SCL
2-Wire Serial-Clock Input. SCL is used to synchronize data movement on the serial
interface. The SCL pin is open drain and requires an external pullup resistor.
6C, 6D
F
2
DC-TCXO Frequency Output
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