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ADA4941-1YRZ-R7 データシート(PDF) 17 Page - Analog Devices |
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ADA4941-1YRZ-R7 データシート(HTML) 17 Page - Analog Devices |
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17 / 23 page  Data Sheet ADA4941-1 Rev. D | Page 17 of 23 Table 7, Table 8, and Table 9 show typical error budgets for the circuits shown in Figure 49, Figure 50, and Figure 51. RF = 1.0 kΩ, RG = 4.99 kΩ, RS_IN = 825 Ω, RS_REF = 0 Ω Table 7. Output Voltage Error Budget for G = 2.4 Amplifier Shown in Figure 49 Error Source Typical Value VOP_error VON_error VO_dm_error VOS_A1 0.1 mV +0.12 mV −0.12 mV +0.24 mV IBP_A1 3 μA +2.48 mV −2.48 mV −4.96 mV IBN_A1 3 μA −2.48 mV +2.48 mV +4.96 mV VOS_A2 0.1 mV 0 mV +0.2 mV +0.2 mV Total VO_error, dm = 0.44 mV RF = 0 Ω, RG = ∞, RS_IN = 0 Ω, RS_REF = 0 Ω Table 8. Output Voltage Error Budget for Amplifier Shown in Figure 50 Error Source Typical Value VOP_error VON_error VO_dm_error VOS_A1 0.1 mV +0.1 mV −0.1 mV +0.2 mV IBP_A1 3 μA +2.48 mV −2.48 mV −4.96 mV IBN_A1 3 μA −2.48 mV +2.48 mV +4.96 mV VOS_A2 0.1 mV 0 mV +0.2 mV +0.2 mV Total VO_error, dm = 0.4 mV RF = 1.02 kΩ, RG = 665 Ω, RS_IN = 402 Ω, RS_REF = 0 Ω Table 9. Output Voltage Error Budget for G = 5 Amplifier Shown in Figure 51 Error Source Typical Value VOP_error VON_error VO_dm_error VOS_A1 0.1 mV +0.25 mV −0.25 mV +0.5 mV IBP_A1 3 μA +1.21 mV −1.21 mV −2.4 mV IBN_A1 3 μA −1.21 mV +1.21 mV +2.4 mV VOS_A2 0.1 mV 0 mV +0.2 mV +0.2 mV Total VO_error, dm = 0.7 mV OUTPUT VOLTAGE NOISE 1kΩ 1kΩ RG RF RS ip–A2 in–A2 vn–A1 500Ω A2 A1 REF IN 2 8 4 5 FB OUT+ + – VOP 1 OUT– + – VON vn–A2 RS–REF ip–A1 in–A1 √4kT (1kΩ) √4kT (1kΩ) √4kT (500Ω) √4kT (RS–REF) √4kTRS √4kTRG √4kTRF Figure 53. Noise Sources Figure 53 shows the major contributors to the ADA4941-1 differential output voltage noise. The differential output noise mean-square voltage equals the sum of twice the noise mean- square voltage contributions from the noninverting channel (A1), plus the noise mean-square voltage terms associated with the inverting channel (A2). 2 2 2 2 2 2 2 2 _ 4 1 2 4 2 4 2 _ 2 ) _ ( 1 2 ) _ ( 1 2 _ , n VON kTR R R R R kTR kTR R A1 in R A1 ip R R A1 vn R R n dm V S G F G F G F F S G F G F O (13) where VON_n 2 is calculated as ) ( 16 (500) 16 (1000) 8 ) _ ( 1000 ) _ 500 )( _ ( 4 4 2 2 2 2 _REF R kT kT kT A2 in REF R A2 ip vn_A2 VON_n S S (14) where: vn_A1 and vn_A2 are the input voltage noises of A1 and A2, each equal to 2.1 nV/√Hz. in_A1, in_A2, ip_A1, and ip_A2 are amplifier input current noise terms, each equal to 1 pA/√Hz. RS, RF, and RG are the external source, feedback, and gain resistors, respectively. kT is Boltzmann’s constant times absolute temperature, equal to 4.2 x 10-21 W-s at room temperature. RS_REF is any source resistance at the REF pin. When A1 is used as a unity gain follower, the output voltage noise spectral density is at its minimum, 10 nV/√Hz. Higher voltage gains have higher output voltage noise. Table 10, Table 11, and Table 12 show the noise contributions and output voltage noise for the circuits in Figure 49, Figure 50, and Figure 51. |
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