Datasheet AD8564 Datasheet (ANALOG DEVICES)

Page 1
Quad 7 ns
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FEATURES

5 V single-supply operation 7 ns propagation delay Low power Separate input and output sections TTL/CMOS logic-compatible outputs Wide output swing TSSOP, SOIC, and PDIP packages

APPLICATIONS

High speed timing Line receivers Data communications High speed V-to-F converters Battery operated instrumentation High speed sampling systems Window comparators PCMCIA cards Upgrade for MAX901 designs
Single Supply Comparator
AD8564

PIN CONFIGURATIONS

–IN A +IN A
GND
OUT A OUT B
V
–ANA
+IN B –IN B
116
AD8564
89
Figure 1. 16-Lead TSSOP
U-16)
(R
–IN A +IN A
GND OUT A OUT B
V
–ANA
+IN B –IN B
AD8564
Figure 2. 16-Lead Narrow Body SOIC
(R
-16)
1
–IN A
2
+IN A
GND
OUT A
V
–ANA
+IN B –IN B
3
4
5
6
7 8
+
AD8564
+
Figure 3. 16-Lead PDIP
(N-16)
–IN D +IN D V
+ANA
OUT D OUT C V
+DIG
+IN C –IN C
1103-003
–IN D +IN D V
+ANA
OUT D OUT C
V
+DIG
+IN C –IN C
01103-001
16
–IN D
15
+IN D
+
V
14
+ANA
13
OUT D
12
OUT COUT B V
11
+DIG
+
+IN C
10
–IN C
9
01103-002

GENERAL DESCRIPTION

The AD8564 is a quad 7 ns comparator with separate input and output supplies, thus enabling the input stage to be operated from ±5 V dual supplies or a 5 V single supply while maintaining a CMOS-/TTL-compatible output.
Fast 7 ns propagation delay makes the AD8564 a good choice for
timing circuits and line receivers. Independent analog and digital supplies provide excellent protection from supply pin interaction. The AD8564 is pin compatible with the MAX901 and has lower supply currents.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
All four comparators have similar propagation delays. The
ropagation delay for rising and falling signals is similar, and
p tracks over temperature and voltage. These characteristics make the AD8564 a good choice for high speed timing and data communications circuits. For a similar single comparator with latch function, refer to the
The AD8564 is specified over the industrial temperature range
°C to +125°C). The quad AD8564 is available in the 16-lead
(−40 TSSOP, 16-lead narrow body SOIC, and 16-lead plastic DIP packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1999–2007 Analog Devices, Inc. All rights reserved.
AD8561 data sheet.
Page 2
AD8564
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TABLE OF CONTENTS

Features.............................................................................................. 1
ESD Caution...................................................................................5
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Specifications............................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5

REVISION HISTORY

8/07—Rev. A to Rev. B
Updated Format..................................................................Universal
Changes to Applications .................................................................. 1
Changes to General Description .................................................... 1
Changes to Specifications................................................................ 3
Changes to the Absolute Maximum Ratings Section .................. 5
Changes to the Applications Information Section....................... 9
Deleted Spice Model Section......................................................... 11
Updated Outline Dimensions....................................................... 12
Changes to Ordering Guide.......................................................... 13
Typical Performance Characteristics..............................................6
Applications Information.................................................................9
Optimizing High Speed Performance........................................9
Output Loading Considerations..................................................9
Input Stage and Bias Currents .....................................................9
Using Hysteresis ......................................................................... 10
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 12
6/99—Rev. 0 to Rev. A
Rev. B | Page 2 of 12
Page 3
AD8564
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SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

V
= V
+ANA
= 5.0 V, V
+DIG
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 2.3 7 mV
−40°C TA ≤ +125°C Offset Voltage Drift ΔVOS/ΔT 4 μV/°C Input Bias Current IB VCM = 0 V ±4 μA
−40°C TA ≤ +125°C Input Offset Current IOS VCM = 0 V ±3 μA Input Common-Mode Voltage Range VCM 0 2.75 V Common-Mode Rejection Ratio CMRR 0 V ≤ VCM ≤ 3.0 V 65 85 dB Large Signal Voltage Gain A Input Capacitance CIN 3.0 pF
DIGITAL OUTPUTS
Logic 1 Voltage VOH IOH = −3.2 mA, ΔVIN > 250 mV 2.4 3.5 V Logic 0 Voltage VOL IOL = 3.2 mA, VIN > 250 mV 0.3 0.4 V
DYNAMIC PERFORMANCE2
Propagation Delay tP 200 mV step with 100 mV overdrive 6.75 9.8 ns
−40°C TA ≤ +125°C1 13 ns 100 mV step with 5 mV overdrive 8 ns Differential Propagation Delay (Rising Propagation Delay vs.
Falling Propagation Delay) Rise Time 20% to 80% 3.8 ns Fall Time 20% to 80% 1.5 ns
POWER SUPPLY
Power Supply Rejection Ratio PSRR 4.5 V ≤ V Analog Supply Current I
−40°C TA ≤ +85°C
−40°C TA ≤ +125°C1 17 mA Digital Supply Current I
−40°C TA ≤ +125°C1 8.0 mA Analog Supply Current I
−40°C TA ≤ +85°C1 15.6 mA
−40°C TA ≤ +125°C1 17 mA
1
Full electrical specifications to −55°C, but these package types are guaranteed for operation from −40°C to +125°C only. Package reliability below −40°C is not guaranteed.
2
Guaranteed by design.
= 0 V, TA = 25°C, unless otherwise noted.
−ANA
1
1
R
VO
Δt
100 mV step with 20 mV overdrive 0.5 2.0 ns
P
10.5 14.0 mA
+ANA
VO = 0 V, RL = ∞ 6.0 7.0 mA
DIG
–7.0 +14.0 mA
−ANA
= 10 kΩ 3000 V/V
L
+ANA
and V
≤ 5.5 V 80 dB
+DIG
1
8 mV
±9 μA
15.6 mA
Rev. B | Page 3 of 12
Page 4
AD8564
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V
= V
+ANA
= 5.0 V, V
+DIG
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 2.3 7 mV
−40°C TA ≤ +125°C Offset Voltage Drift ΔVOS/ΔT 4 μV/°C Input Bias Current IB VCM = 0 V ±4 μA
−40°C TA ≤ +125°C Input Offset Current IOS VCM = 0 V ±3 μA Input Common-Mode Voltage Range VCM −4.9 +3.5 V Common-Mode Rejection Ratio CMRR 0 V ≤ VCM ≤ 3.0 V 65 85 dB Large Signal Voltage Gain AVO RL = 10 kΩ 3000 V/V Input Capacitance CIN 3.0 pF
DIGITAL OUTPUTS
Logic 1 Voltage VOH IOH = –3.2 mA, ΔVIN > +250 mV 2.6 3.6 V Logic 0 Voltage VOL IOL = 3.2 mA, ΔVIN > 250 mV 0.2 0.3 V
DYNAMIC PERFORMANCE2
Propagation Delay tP 200 mV step with 100 mV overdrive 6.75 9.8 ns
−40°C TA ≤ +85°C1 8 13 ns 100 mV step with 5 mV overdrive 8 ns Differential Propagation Delay (Rising Propagation Delay
vs. Falling Propagation Delay) Rise Time 20% to 80% 3 ns Fall Time 20% to 80% 3 ns
POWER SUPPLY
Power Supply Rejection Ratio PSRR 4.5 V ≤ V Analog Supply Current I
−40°C TA ≤ +85°C1 15.6 mA
−40°C TA ≤ +125°C Digital Supply Current I
−40°C TA ≤ +125°C1 5.6 mA Analog Supply Current I
−40°C TA ≤ +85°C1 15.6 mA
−40°C TA ≤ +125°C1 17 mA
1
Full electrical specifications to −55°C, but these package types are guaranteed for operation from −40°C to +125°C only. Package reliability below −40°C is not guaranteed.
2
Guaranteed by design.
= −5 V, TA = 25°C, unless otherwise noted.
−ANA
Δt
+ANA
DIG
−ANA
1
1
100 mV step with 20 mV overdrive 0.5 2.0 ns
P
+ANA
and V
≤ 5.5 V 50 70 dB
+DIG
10 mV
±9 μA
10.8 14.0 mA
1
17 mA
VO = 0 V, RL = ∞ 3.6 4.4 mA
−8.2 +14.0 mA
Rev. B | Page 4 of 12
Page 5
AD8564
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ABSOLUTE MAXIMUM RATINGS

Table 3.
Parameter Rating
Total Analog Supply Voltage 14 V Digital Supply Voltage 17 V Analog Positive Supply to Digital Positive Supply −600 mV Input Voltage1 ±7 V Differential Input Voltage ±8 V Output Short-Circuit Duration to GND Indefinite Storage Temperature Range −65°C to +150°C Operating Temperature Range −55°C to +125°C Junction Temperature Range −65°C to +150°C Lead Temperature Range (Soldering, 10 sec) 300°C
1
The analog input voltage is equal to ±7 V or the analog supply voltage,
whichever is less.
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages (SOIC and TSSOP). θ
Table 4. Thermal Resistance
Package Type θJA θ
16-Lead PDIP (N) 90 47 °C/W 16-Lead Narrow Body SOIC (R) 113 37 °C/W 16-Lead TSSOP (RU) 180 37 °C/W
is specified for device in socket for PDIP.
JA
Unit
JC

ESD CAUTION

Rev. B | Page 5 of 12
Page 6
AD8564
G A
A
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TYPICAL PERFORMANCE CHARACTERISTICS

V
= V
+ANA
1.0
+DIG
= 5 V, V
= 0 V, TA = 25°C, unless otherwise noted.
–ANA
500
0.8
0.6
0.4
INPUT OFFSET VOLTAGE (mV)
0.2
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 4. Input Offset Voltage vs. Temperature
0
–1
–2
–3
INPUT BIAS CURRENT (µA)
–4
400
300
200
NUMBER OF AMP LIFIERS
100
0
–5 –4 –3 –2 –1 0 1 2 3 4
01103-004
INPUT OFFSET VOLTAGE (mV)
5
01103-007
Figure 7. Input Offset Voltage Distribution
10
8
Y (ns)
6
TION DEL
4
PROPA
2
t
PDHL
t
PDLH
STEPSIZE = 100mV OVERDRIVE = 5 mV
–5
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 5. Input Bias Current vs. Temperature
0
V
= V
+ANA
V
–ANA
–1
–2
–3
INPUT BIAS CURRE NT (µA)
–4
–5
–7.5 –5.0 –2.5 0 2.5 5.0
= +5V
+DIG
= –5V
INPUT COMMON-MODE VOLTAGE (V)
Figure 6. Input Bias Current vs. Input Common-Mode Voltage
0
01103-005
–50 –25 0 25 50 75 100 125
Figure 8. Propagation Delay, t
5.0
4.4
3.8
3.2
OUTPUT HIGH VOLTAGE (mV)
2.6
2.0
01103-006
036912
Figure 9. Output High Voltage, V
TEMPERATURE (°C)
TA = +85°C
= +25°C
T
A
T
= –40°C
A
SOURCE CURRENT (mA)
vs. Temperature
PDHL/tPDLH
vs. Source Current
OH
01103-008
15
01103-009
Rev. B | Page 6 of 12
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AD8564
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0.5
3.0
0.4
= +25°C
T
0.3
0.2
OUTPUT LOW VOLTAGE (V)
0.1
0
0 3 6 9 12 15
A
Figure 10. Output Low Voltage, V
5
4
3
2
SUPPLY CURRENT (mA)
+ANA
I
1
= –40°C
T
A
TA = +85°C
SINK CURRENT (mA)
OL
TA = +85°C
T
= +25°C
A
= –40°C
T
A
vs. Sink Current
2.5
2.0 T
= +25°C
1.5
1.0
SUPPLY CURRENT (mA)
+DIG
I
0.5
0
2 4 6 8 10 12
01103-010
Figure 13. I
5
4
3
2
SUPPLY CURRENT (mA)
+ANA
I
1
Supply Current/Comparator vs. V
+DIG
A
V
SUPPLY VOLTAGE (V)
+DIG
V
= ±5V
+ANA
V
+ANA
T
T
= +5V
= +85°C
A
= –40°C
A
Supply Voltage
+DIG
01103-013
0
2468101
Figure 11. I
Figure 12. I
+ANA
0
–1
–2
–3
SUPPLY CURRENT (mA)
–ANA
I
–4
–5
2 4 6 8 10 12
−ANA
V
SUPPLY VOLTAGE (V)
+ANA
Supply Current/Comparator vs. V
T
= –40°C
A
= +25°C
T
A
= +85°C
T
A
V
SUPPLY VOLTAGE (V)
–ANA
Supply Current/Comparator vs. V
Supply Voltage
+ANA
Supply Voltage
−ANA
2
01103-011
01103-012
0
–75 –50 –25 0 25 50 75 100 125 150
Figure 14. I
0
–1
–2
–3
SUPPLY CURRENT (mA)
–ANA
I
–4
–5
–75 –50 –25 0 25 50 75 100 125 150
Figure 15. I
+ANA
−ANA
TEMPERATURE (°C)
Supply Current/Comparator vs. Temperature
V
= +5V
+ANA
V
= ±5V
+ANA
TEMPERATURE (°C)
Supply Current/Comparator vs. Temperature
01103-014
01103-015
Rev. B | Page 7 of 12
Page 8
AD8564
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2.0
1.5
1.0
SUPPLY CURRENT (mA)
0.5
+DIG
I
0
–75 –50 –25 0 25 50 75 100 125 150
Figure 16. I
+DIG
TEMPERATURE (°C)
Supply Current/Comparator vs. Temperature
01103-016
Rev. B | Page 8 of 12
Page 9
AD8564
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APPLICATIONS INFORMATION

OPTIMIZING HIGH SPEED PERFORMANCE

As with any high speed comparator or amplifier, proper design and layout techniques should be used to ensure optimal perform­ance from the AD8564. The performance limits of high speed circuitry can easily be a result of stray capacitance, improper ground impedance, or other layout issues.
Minimizing resistance from the source to the input is an important
nsideration in maximizing the high speed operation of the
co AD8564. Source resistance, in combination with equivalent input capacitance, may cause a lagged response at the input, thus delaying the output. The input capacitance of the AD8564, in combination with stray capacitance from an input pin to ground, may result in several picofarads of equivalent capaci­tance. A combination of 3 kΩ source resistance and 5 pF of input capacitance yields a time constant of 15 ns, which is slower than the 5 ns capability of the AD8564. Source impedances should be less than 1 kΩ for the best performance.
It is also important to provide bypass capacitors for the power su
pply in a high speed application. A 1 μF electrolytic bypass capacitor should be placed within 0.5 inches of each power supply pin to ground. These capacitors reduce any potential voltage ripples from the power supply. In addition, a 10 nF ceramic capacitor should be placed as close as possible to the power supply pins to ground. These capacitors act as a charge reservoir for the device during high frequency switching.

OUTPUT LOADING CONSIDERATIONS

The AD8564 output can deliver up to 40 mA of output current without any significant increase in propagation delay. The output of the device should not be connected to more than 20 TTL input logic gates or drive a load resistance less than 100 Ω.
To ensure the best performance from the AD8564, it is important to
minimize capacitive loading of the output of the device. Capacitive loads greater than 50 pF cause ringing on the output waveform and reduce the operating bandwidth of the comparator. Propagation delay also increases with capacitive loads above 100 pF.

INPUT STAGE AND BIAS CURRENTS

The AD8564 uses a PNP differential input stage that enables the input common-mode range to extend all the way from the negative supply rail to within 2.2 V of the positive supply rail. The input common-mode voltage can be found as the average of the voltage at the two inputs of the device. To ensure the fastest response time, care should be taken to not allow the input common-mode voltage to exceed this voltage.
The input bias current for the AD8564 is 4 μA. As with any
NP differential input stage, this bias current goes to 0 on an
P input that is high and doubles on an input that is low. Care should be taken in choosing resistor values to be connected to the inputs because large resistors could cause significant voltage drops due to the input bias current.
A ground plane is recommended for proper high speed perform­an
ce. This can be created by using a continuous conductive plane over the surface of the circuit board, only allowing breaks in the plane for necessary current paths. The ground plane provides a low inductance ground, eliminating any potential differences at different ground points throughout the circuit board caused from ground bounce. A proper ground plane also minimizes the effects of stray capacitance on the circuit board.
The input capacitance for the AD8564 is typically 3 pF. This can b
e measured by inserting a large source resistance to the input
and measuring the change in propagation delay.
Rev. B | Page 9 of 12
Page 10
AD8564
V
(
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USING HYSTERESIS

Hysteresis can easily be added to a comparator through the addition of positive feedback. Adding hysteresis to a comparator offers an advantage in noisy environments where it is not desirable for the output to toggle between states when the input signal is near the switching threshold.
nfiguring the AD8564 with hysteresis.
co
SIGNAL
REF
Figure 17. Configuring the AD8564 with Hysteresis
The input signal is connected directly to the inverting input of the comparator. The output is fed back to the noninverting input through R2 and R1. The ratio of R1 to R1 + R2 and the output swing establishes the width of the hysteresis window, with V
setting the center of the window or the average
REF
switching voltage. The output switches high when the input
Figure 17 shows a method for
COMPARATOR
R1
R2
C
F
01103-017
voltage is greater than V the input voltage is less than V
1
+
⎛ ⎜
VV
1
REF
LO
where
V
+
The C
capacitor may also be added to introduce a pole into
F
⎜ ⎝
is the positive supply voltage.
the feedback network. This has the effect of increasing the amount of hysteresis at high frequencies. This can be useful when comparing a relatively slow signal in a high frequency noise environment.
At frequencies greater than
window approaches
At frequencies less than in Equation 1.
and does not switch low again until
HI
, as given in Equation 2.
LO
R1
)
VVV
=
V
HI
R2R1
+
R1
(2)
+−=R2R1
f
P
= V+ – 1 V and VLO = 0 V.
f
, the threshold voltages remain as it is
P
(1)
V
REFREFHI
1
, the hysteresis
R2C
π=2
F
Rev. B | Page 10 of 12
Page 11
AD8564
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OUTLINE DIMENSIONS

0.800 (20.32)
0.790 (20.07)
0.780 (19.81)
0.210 (5.33)
0.150 (3.81)
0.130 (3.30)
0.115 (2.92)
0.022 (0.56)
0.018 (0.46)
0.014 (0.36)
16
1
0.100 (2.54) BSC
MAX
0.070 (1.78)
0.060 (1.52)
0.045 (1.14)
CONTRO LLING DIME N S IONS ARE IN INCHES ; MIL LIMETER DIM ENSIO NS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS F OR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIG URE D AS WHOLE OR HALF LEADS.
Figure 18. 16-Lead Plastic Dual In-Line Package [PDIP]
9
0.280 (7.11)
0.250 (6.35)
0.240 (6.10)
8
0.060 (1.52)
0.015 (0.38)
0.015 (0.38)
MIN
SEATING PLANE
0.005 (0.13) MIN
COMPLIANT TO JEDEC STANDARDS MS-001-AB
GAUGE
PLANE
MAX
0.325 (8.26)
0.310 (7.87)
0.300 (7.62)
0.430 (10.92)
(N-16)
Dim
ensions shown in inches and (millimeters)
MAX
0.195 (4.95)
0.130 (3.30)
0.115 (2.92)
0.014 (0.36)
0.010 (0.25)
0.008 (0.20)
073106-B
10.00 (0.3937)
9.80 (0.3858)
4.00 (0.1575)
3.80 (0.1496)
0.25 (0.0098)
0.10 (0.0039)
COPLANARITY
0.10
CONTROLLING DIME NSIONS ARE IN MIL LIMETERS ; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OF F MILLIMETER EQ UIVALENTS FOR REFERENCE ONLYAND ARE NOT APPROPRIATE FOR USE IN DE S IGN.
16
1
1.27 (0.0500) BSC
0.51 (0.0201)
0.31 (0.0122)
COMPLIANT TO JEDEC STANDARDS MS-012-AC
9
6.20 (0.2441)
5.80 (0.2283)
8
1.75 (0.0689)
1.35 (0.0531)
SEATING PLANE
8° 0°
0.25 (0.0098)
0.17 (0.0067)
0.50 (0.0197)
0.25 (0.0098)
1.27 (0.0500)
0.40 (0.0157)
45°
060606-A
Figure 19. 16-Lead Standard Small Outline Package [SOIC_N]
Nar
row Body
(R-16)
Dimensions shown in millimeters and (inches)
Rev. B | Page 11 of 12
Page 12
AD8564
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4.50
4.40
4.30
PIN 1
0.15
0.05
0.65 BSC
Figure 20. 16-Lead Thin Shrink S
5.10
5.00
4.90
16
COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-153-AB
0.10
0.30
0.19
9
81
1.20 MAX
SEATING PLANE
6.40 BSC
0.20
0.09
mall Outline Package [TSSOP]
8° 0°
0.75
0.60
0.45
(RU-16)
Dimensions shown in millimeters

ORDERING GUIDE

Model Temperature Range Package Description Package Option
AD8564AN −40°C to +125°C 16-Lead Plastic Dual In-Line Package [PDIP] N-16 AD8564ANZ AD8564AR −40°C to +125°C 16-Lead Standard Small Outline Package [SOIC_N] AD8564AR-REEL −40°C to +125°C 16-Lead Standar AD8564AR-REEL7 −40°C to +125°C 16-Lead Standar AD8564ARZ AD8564ARZ-REEL AD8564ARZ-REEL7 AD8564ARU-REEL −40°C to +125°C 16-Lead Thin Shr AD8564ARUZ-REEL
1
Z = RoHS Compliant Part.
1
−40°C to +125°C 16-Lead Plastic Dual In-Line Package [PDIP] N-16 R-16
d Small Outline Package [SOIC_N] R-16 d Small Outline Package [SOIC_N] R-16
1
−40°C to +125°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
1
−40°C to +125°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
1
−40°C to +125°C 16-Lead Standard Small Outline Package [SOIC_N] R-16
ink Small Outline Package [TSSOP] RU-16
1
−40°C to +125°C 16-Lead Thin Shrink Small Outline Package [TSSOP] RU-16
©1999–2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C01103-0-8/07(B)
Rev. B | Page 12 of 12
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